JEE Main
Physics
Magnetic Effect of Current
Previous Years Questions

## Numerical

A moving coil galvanometer has 100 turns and each turn has an area of $2.0 \mathrm{~cm}^2$. The magnetic field produced by the magnet is $0.01 \mathrm... A regular polygon of 6 sides is formed by bending a wire of length$4 \pi$meter. If an electric current of$4 \pi \sqrt{3}$A is flowing through the ... Two circular coils $$P$$ and $$Q$$ of 100 turns each have same radius of $$\pi \mathrm{~cm}$$. The currents in $$P$$ and $$R$$ are $$1 A$$ and $$2 A$$... An electron moves through a uniform magnetic field $$\vec{B}=B_0 \hat{i}+2 B_0 \hat{j} T$$. At a particular instant of time, the velocity of electron ... The current of $$5 \mathrm{~A}$$ flows in a square loop of sides $$1 \mathrm{~m}$$ is placed in air. The magnetic field at the centre of the loop is$...
A charge of $$4.0 \mu \mathrm{C}$$ is moving with a velocity of $$4.0 \times 10^6 \mathrm{~ms}^{-1}$$ along the positive $$y$$ axis under a magnetic f...
The magnetic field at the centre of a wire loop formed by two semicircular wires of radii $$R_1=2 \pi \mathrm{m}$$ and $$R_2=4 \pi \mathrm{m}$$, carry...
Two long, straight wires carry equal currents in opposite directions as shown in figure. The separation between the wires is $$5.0 \mathrm{~cm}$$. The...
An electron in a hydrogen atom revolves around its nucleus with a speed of $6.76 \times 10^6 \mathrm{~ms}^{-1}$ in an orbit of radius $0.52 \mathrm{~A... A straight wire $$\mathrm{AB}$$ of mass $$40 \mathrm{~g}$$ and length $$50 \mathrm{~cm}$$ is suspended by a pair of flexible leads in uniform magnetic... A straight wire carrying a current of $$14 \mathrm{~A}$$ is bent into a semi-circular arc of radius $$2.2 \mathrm{~cm}$$ as shown in the figure. The m... The ratio of magnetic field at the centre of a current carrying coil of radius $$r$$ to the magnetic field at distance $$r$$ from the centre of coil o... A proton with a kinetic energy of $$2.0 ~\mathrm{eV}$$ moves into a region of uniform magnetic field of magnitude $$\frac{\pi}{2} \times 10^{-3} \math... Two identical circular wires of radius$$20 \mathrm{~cm}$$and carrying current$$\sqrt{2} \mathrm{~A}$$are placed in perpendicular planes as shown i... A charge particle of$$2 ~\mu \mathrm{C}$$accelerated by a potential difference of$$100 \mathrm{~V}$$enters a region of uniform magnetic field of m... Two long parallel wires carrying currents 8A and 15A in opposite directions are placed at a distance of 7 cm from each other. A point P is at equidist... A single turn current loop in the shape of a right angle triangle with sides 5 cm, 12 cm, 13 cm is carrying a current of 2 A. The loop is in a uniform... A closely wounded circular coil of radius 5 cm produces a magnetic field of$$37.68 \times 10^{-4} \mathrm{~T}$$at its center. The current through th... A wire of length$$314 \mathrm{~cm}$$carrying current of$$14 \mathrm{~A}$$is bent to form a circle. The magnetic moment of the coil is ________ A ... A singly ionized magnesium atom (A = 24) ion is accelerated to kinetic energy 5 keV, and is projected perpendicularly into a magnetic field B of the m... A deuteron and a proton moving with equal kinetic energy enter into a uniform magnetic field at right angle to the field. If rd and rp are the radii o... Two 10 cm long, straight wires, each carrying a current of 5A are kept parallel to each other. If each wire experienced a force of 10$$-$$5 N, then se... A long solenoid with 1000 turns/m has a core material with relative permeability 500 and volume 103 cm3. If the core material is replaced by another m... A uniform conducting wire of length is 24a, and resistance R is wound up as a current carrying coil in the shape of an equilateral triangle of side 'a... A coil in the shape of an equilateral triangle of side 10 cm lies in a vertical plane between the pole pieces of permanent magnet producing a horizont... Two short magnetic dipoles m1 and m2 each having magnetic moment of 1 Am2 are placed at point O and P respectively. The distance between OP is 1 meter... A galvanometer coil has 500 turns and each turn has an average area of 3$$ \times $$10–4 m2 . If a torque of 1.5 Nm is required to keep this coil pa... ## MCQ (Single Correct Answer) A uniform magnetic field of$$2 \times 10^{-3} \mathrm{~T}$$acts along positive$$Y$$-direction. A rectangular loop of sides$$20 \mathrm{~cm}$$and ... A rigid wire consists of a semicircular portion of radius$$R$$and two straight sections. The wire is partially immerged in a perpendicular magnetic ... Two insulated circular loop A and B of radius '$$a$$' carrying a current of '$$\mathrm{I}$$' in the anti clockwise direction as shown in the figure. T... Two particles$$X$$and$$Y$$having equal charges are being accelerated through the sat potential difference. Thereafter they enter normally in a reg... A proton moving with a constant velocity passes through a region of space without any change in its velocity. If$$\overrightarrow{\mathrm{E}}$$and ... An electron is moving along the positive$$\mathrm{x}$$-axis. If the uniform magnetic field is applied parallel to the negative z-axis, then A. The el... The source of time varying magnetic field may be (A) a permanent magnet (B) an electric field changing linearly with time (C) direct current (D) a dec... An electron is allowed to move with constant velocity along the axis of current carrying straight solenoid. A. The electron will experience magnetic f... A charge particle moving in magnetic field B, has the components of velocity along B as well as perpendicular to B. The path of the charge particle wi... A long straight wire of circular cross-section (radius a) is carrying steady current I. The current I is uniformly distributed across this cross-secti... As shown in the figure, a long straight conductor with semicircular arc of radius$$\frac{\pi}{10}$$m is carrying current$$\mathrm{I=3A}$$. The magni... Find the magnetic field at the point$$\mathrm{P}$$in figure. The curved portion is a semicircle connected to two long straight wires. ... A long conducting wire having a current I flowing through it, is bent into a circular coil of \mathrm{N} turns. Then it is bent into a circular coil... A rod with circular cross-section area$$2 \mathrm{~cm}^{2}$$and length$$40 \mathrm{~cm}$$is wound uniformly with 400 turns of an insulated wire. I... As shown in the figure, a current of 2 \mathrm{~A} flowing in an equilateral triangle of side 4 \sqrt{3} \mathrm{~cm}. The magnetic field at the c... A current carrying rectangular loop PQRS is made of uniform wire. The length P R=Q S=5 \mathrm{~cm} and P Q=R S=100 \mathrm{~cm}. If ammeter curre... A massless square loop, of wire of resistance$$10 \Omega$$, supporting a mass of$$1 \mathrm{~g}$$, hangs vertically with one of its sides in a unifo... The magnetic moments associated with two closely wound circular coils$$\mathrm{A}$$and$$\mathrm{B}$$of radius$$\mathrm{r}_{\mathrm{A}}=10\ma... The electric current in a circular coil of four turns produces a magnetic induction 32 T at its centre. The coil is unwound and is rewound into a circ... The magnitude of magnetic induction at mid point $$\mathrm{O}$$ due to current arrangement as shown in Fig will be ... A single current carrying loop of wire carrying current I flowing in anticlockwise direction seen from +ve $$\mathrm{z}$$ direction and lying in $$x y... For a moving coil galvanometer, the deflection in the coil is 0.05 rad when a current of 10 mA is passes through it. If the torsional constant of susp... Match List I with List II .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-family... A long solenoid is formed by winding 70 turns cm$$^{-1}$$. If 2.0 A current flows, then the magnetic field produced inside the solenoid is ___________... Two long straight wires P and Q carrying equal current 10A each were kept parallel to each other at 5 cm distance. Magnitude of magnetic force experie... A circular loop of radius$$r$$is carrying current I A. The ratio of magnetic field at the center of circular loop and at a distance r from the cente... A wire X of length$$50 \mathrm{~cm}$$carrying a current of$$2 \mathrm{~A}$$is placed parallel to a long wire$$\mathrm{Y}$$of length$$5 \mathrm{... A triangular shaped wire carrying $$10 \mathrm{~A}$$ current is placed in a uniform magnetic field of $$0.5 \mathrm{~T}$$, as shown in figure. The mag... The magnetic field at the center of current carrying circular loop is $$B_{1}$$. The magnetic field at a distance of $$\sqrt{3}$$ times radius of the ... The current sensitivity of a galvanometer can be increased by : (A) decreasing the number of turns (B) increasing the magnetic field (C) decreasing th... As shown in the figure, a metallic rod of linear density $$0.45 \mathrm{~kg} \mathrm{~m}^{-1}$$ is lying horizontally on a smooth inclined plane which... A cyclotron is used to accelerate protons. If the operating magnetic field is $$1.0 \mathrm{~T}$$ and the radius of the cyclotron 'dees' is $$60 \math... Two concentric circular loops of radii$$r_{1}=30 \mathrm{~cm}$$and$$r_{2}=50 \mathrm{~cm}$$are placed in$$\mathrm{X}-\mathrm{Y}$$plane as shown ... A charge particle is moving in a uniform magnetic field$$(2 \hat{i}+3 \hat{j}) \,\mathrm{T}$$. If it has an acceleration of$$(\alpha \hat{i}-4 \hat{... $$\mathrm{B}_{X}$$ and $$\mathrm{B}_{\mathrm{Y}}$$ are the magnetic fields at the centre of two coils $$\mathrm{X}$$ and $$\mathrm{Y}$$ respectively e... Two charged particles, having same kinetic energy, are allowed to pass through a uniform magnetic field perpendicular to the direction of motion. If t... A coil of n number of turns wound tightly in the form of a spiral with inner and outer radii r1 and r2 respectively. When a current of strength I is p... A cyclotron is working at a frequency of 10 MHz. If the radius of its dees is 60 cm. The maximum kinetic energy of accelerated proton will be : (Take ... Two long current carrying conductors are placed to each other at a distance of 8 cm between them. The magnitude of magnetic field produced at mid-poin... Given below are two statements : Statement I : The electric force changes the speed of the charged particle and hence changes its kinetic energy; wher... A charge particle moves along circular path in a uniform magnetic field in a cyclotron. The kinetic energy of the charge particle increases to 4 times... Two parallel, long wires are kept 0.20 m apart in vacuum, each carrying current of x A in the same direction. If the force of attraction per meter of ... An infinitely long hollow conducting cylinder with radius R carries a uniform current along its surface. Choose the correct representation of magnetic... Two long parallel conductors S1 and S2 are separated by a distance 10 cm and carrying currents of 4A and 2A respectively. The conductors are placed al... A proton and an alpha particle of the same velocity enter in a uniform magnetic field which is acting perpendicular to their direction of motion. The ... A long solenoid carrying a current produces a magnetic field B along its axis. If the current is doubled and the number of turns per cm is halved, the... A long straight wire with a circular cross-section having radius R, is carrying a steady current I. The current I is uniformly distributed across this... A proton, a deutron and an $$\alpha$$-particle with same kinetic energy enter into a uniform magnetic field at right angle to magnetic field. The rati... Given below are two statements : One is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : In an uniform magnetic fiel... The magnetic field at the centre of a circular coil of radius r, due to current I flowing through it, is B. The magnetic field at a point along the ax... There are two infinitely long straight current carrying conductors and they are held at right angles to each other so that their common ends meet at t... A current of 1.5 A is flowing through a triangle, of side 9 cm each. The magnetic field at the centroid of the triangle is :(Assume that the current i... A coil having N turns is wound tightly in the form of a spiral with inner and outer radii 'a' and 'b' respectively. Find the magnetic field at centre,... A coaxial cable consists of an inner wire of radius 'a' surrounded by an outer shell of inner and outer radii 'b' and 'c' respectively. The inner wire... Two ions of masses 4 amu and 16 amu have charges +2e and +3e respectively. These ions pass through the region of constant perpendicular magnetic field... The fractional change in the magnetic field intensity at a distance 'r' from centre on the axis of current carrying coil of radius 'a' to the magnetic... Figure A and B shown to long straight wires of circular cross-section (a and b with a < b), carrying current I which is uniformly distributed acros... Two ions having same mass have charges in the ratio 1 : 2. They are projected normally in a uniform magnetic field with their speeds in the ratio 2 : ... A deuteron and an alpha particle having equal kinetic energy enter perpendicularly into a magnetic field. Let rd and r$$\alpha$$ be their respective r... A proton and an $$\alpha$$-particle, having kinetic energies Kp and K$$\alpha$$ respectively, enter into a magnetic field at right angles.The ratio of... Four identical long solenoids A, B, C and D are connected to each other as shown in the figure. If the magnetic field at the center of A is 3T, the fi... A loop of flexible wire of irregular shape carrying current is placed in an external magnetic field. Identify the effect of the field on the wire. A hairpin like shape as shown in figure is made by bending a long current carrying wire. What is the magnitude of a magnetic field at point P which li... A solenoid of 1000 turns per metre has a core with relative permeability 500. Insulated windings of the solenoid carry an electric current of 5A. The ... A charge Q is moving $$\overrightarrow {dl}$$ distance in the magnetic field $$\overrightarrow {B}$$. Find the value of work done by $$\overrightarr... A proton, a deuteron and an$$\alpha$$particle are moving with same momentum in a uniform magnetic field. The ratio of magnetic forces acting on them... Magnetic fields at two points on the axis of a circular coil at a distance of 0.05 m and 0.2 m from the centre are in the ratio 8 : 1. The radius of c... A charged particle going around in a circle can be considered to be a current loop. A particle of mass m carrying charge q is moving in a plane with s... A square loop of side 2$$a$$and carrying current I is kept in xz plane with its centre at origin. A long wire carrying the same current I is placed p... An electron is moving along +x direction with a velocity of 6$$ \times $$106 ms–1. It enters a region of uniform electric field of 300 V/cm pointin... A particle of charge q and mass m is moving with a velocity$$ - v\widehat i$$(v$$ \ne $$0) towards a large screen placed in the Y - Z plane at a d... An iron rod of volume 10–3 m3 and relative permeability 1000 is placed as core in a solenoid with 10 turns/cm. If a current of 0.5 A is passed through... A square loop of side 2$$a$$, and carrying current I, is kept in XZ plane with its centre at origin. A long wire carrying the same current I is placed... A circular coil has moment of inertia 0.8 kg m2 around any diameter and is carrying current to produce a magnetic moment of 20 Am2 . The coil is kept... A wire A, bent in the shape of an arc of a circle, carrying a current of 2 A and having radius 2 cm and another wire B, also bent in the shape of arc ... A charged particle carrying charge 1$$\mu $$C is moving with velocity$$\left( {2\widehat i + 3\widehat j + 4\widehat k} \right)$$ms–1. If an extern... Magnitude of magnetic field (in SI units) at the centre of a hexagonal shape coil of side 10 cm, 50 turns and carrying current I (Ampere) in units of ... The figure shows a region of length ‘l’ with a uniform magnetic field of 0.3 T in it and a proton entering the region with velocity 4$$ \times $$105... A wire carrying current I is bent in the shape ABCDEFA as shown, where rectangle ABCDA and ADEFA are perpendicular to each other. If the sides of the ... A beam of protons with speed 4 × 105 ms–1 enters a uniform magnetic field of 0.3 T at an angle of 60° to the magnetic field. The pitch of the resultin... An electron gun is placed inside a long solenoid of radius R on its axis. The solenoid has n turns/length and carries a current I. The electron gun sh... A small circular loop of conducting wire has radius a and carries current I. It is placed in a uniform magnetic field B perpendicular to its plane suc... A long, straight wire of radius a carries a current distributed uniformly over its cross-section. The ratio of the magnetic fields due to the wire at ... A charged particle of mass 'm' and charge 'q' moving under the influence of uniform electric field$$E\overrightarrow i $$and a uniform magnetic fiel... A very long wire ABDMNDC is shown in figure carrying current I. AB and BC parts are straight, long and at right angle. At D wire forms a circular turn... Photon with kinetic energy of 1MeV moves from south to north. It gets an acceleration of 1012 m/s2 by an applied magnetic field (west to east). The va... A particle of mass m and charge q has an initial velocity$$\overrightarrow v = {v_0}\widehat j$$. If an electric field$$\overrightarrow E = {E_0}... An electron, moving along the x-axis with an initial energy of 100 eV, enters a region of magnetic field $$\overrightarrow B = \left( {1.5 \times {{1... Find the magnetic field at point P due to a straight line segment AB of length 6 cm carrying a current of 5A. (See figure) ($$\mu $$0 = 4$$\pi $$× 10... A thin ring of 10 cm radius carries a uniformly distributed charge. The ring rotates at a constant angular speed of 40$$\pi $$rad s–1 about its axi... A square loop is carrying a steady current I and the magnitude of its magnetic dipole moment is m. if this square loop is changed to a circular loop a... The magnitude of the magnetic field at the centre of an equilateral triangular loop of side 1 m which is carrying a current of 10 A is : [Take$$\mu$...
A proton, an electron, and a Helium nucleus, have the same energy. They are in circular orbits in a plane due to magnetic field perpendicualr to the p...
Two wires A & B are carrying currents I1 & I2 as shown in the figure. The separation between them is d. A third wire C carrying a current I is...
A moving coil galvanometer has a coil with 175 turns and area 1 cm2. It uses a torsion band of torsion constant 10–6 N-m/rad. The coil is placed in a ...
A rigid square loop of side 'a' and carrying current I2 is lying on a horizontal surface near a long current I1 carrying wire in the same plane as sho...
A rectangular coil (Dimension 5 cm × 2.5 cm) with 100 turns, carrying a current of 3 A in the clock-wise direction is kept centered at the origin and ...
Two very long, straight, and insulated wires are kept at 90° angle from each other in xy-plane as shown in the figure. These wires carry currents of e...
A circular coil having N turns and radius r carries a current I. It is held in the XZ plane in a magnetic field B$${\mathop i\limits^ \wedge }$$ . Th...
A thin strip 10 cm long is on a U shaped wire of negligible resistance and it is connected to a spring of spring constant 0.5 Nm–1 (see figure). The a...
As shown in the figure, two infinitely long, identical wires are bent by 90o and placed in such a way that the segments LP and QM are along the x-axis...
A proton and an $$\alpha$$-particle (with their masses in the ratio of 1 : 4 and charges in the ratio of 1 : 2) are accelerated from rest through a p...
The region between y = 0 and y = d contains a magnetic field $$\overrightarrow B = B\widehat z$$. A particle of mass m and charge q enters the regio...
A particle of mass m and charge q is in an electric and magnetic field given by $$\overrightarrow E = 2\widehat i + 3\widehat j;\,\,\,\overrightarrow... In an experiment, electrons are accelerated, from rest, by applying a voltage of 500 V. Calculate the radius of the path if a magnetic field 100 mT is... A hoop and a solid cylinder of same mass and radius are made of a permanent magnetic material with their magnetic moment parallel to their respective ... An insulating thin rod of length$$l$$has a linear charge density$$\rho \left( x \right)$$=$${\rho _0}{x \over l}$$on it. The rod is rotated abou... A particle having the same charge as of electron moves in a ciurcular path of radius 0.5 cm under the influence of a magnetic field 0f 0.5 T. If an el... One of the two identical conducting wires of length L is bent in the form of a circular loop and the other one into a circular coil of N identical tur... A current loop, having two circular arcs joined by two radial lines is shown in the figure. It carries a current of 10 A. The magnetic field at point ... An infinitely long current carrying wire and a small current carrying loop are in the plane of the paper as shown. The radius of the loop is a and dis... A charge q is spread uniformly over an insulated loop of radius r. If it is rotated with an angular velocity$$\omega $$with resect to normal axis t... An electron, a proton and an alpha particle having the same kinetic energy are moving in circular orbits of radii re, rp, r$$_\alpha$$respectively in... The dipole moment of a circular loop carrying a current I, is m and the magnetic field at the centre of the loop is B1. When the dipole moment is doub... A current of 1 A is flowing on the sides of an equilateral triangle of side 4.5$$ \times $$10-2 m. The magnetic field at the center of the triangle ... A Helmholtz coil has a pair of loops, each with$$N$$turns and radius$$R$$. They are placed coaxially at distance$$R$$and the same current$${\rm ...
A negative test charge is moving near a long straight wire carrying a current. The force acting on the test charge is parallel to the direction of the...
In a certain region static electric and magnetic fields exist. The magnetic field is given by $$\overrightarrow B = {B_0}\left( {\widehat i + 2\wideh... A magnetic dipole in a constant magnetic field has : A magnetic dipole is acted upon by two magnetic fields which are inclined to each other at an angle of 75o. One of the fields has a magnitude of 15 mT... To know the resistance G of a galvanometer by half deflection method, a battery of emf VE and resistance R is used to deflect the galvanometer by angl... Two identical wires$$A$$and$$B,$$each of length$$'l'$$, carry the same current$$I$$. Wire$$A$$is bent into a circle of radius$$R$$and wire ... Two long current carrying thin wires, both with current$$I,$$are held by insulating threads of length$$L$$and are in equilibrium as shown in the f... A rectangular loop of sides$$10cm$$and$$5cm$$carrying a current$$1$$of$$12A$$is placed in different orientations as shown in the fig... A conductor lies along the$$z$$-axis at$$ - 1.5 \le z < 1.5\,m$$and carries a fixed current of$$10.0A$$in$$ - {\widehat a_z}$$direction... Proton, deuteron and alpha particle of same kinetic energy are moving in circular trajectories in a constant magnetic field. The radii of proton, denu... A charge$$Q$$is uniformly distributed over the surface of non-conducting disc of radius$$R.$$The disc rotates about an axis perpendicular to its p... A current$$I$$flows in an infinitely long wire with cross section in the form of a semi-circular ring of radius$$R.$$The magnitude of the magnetic... Two long parallel wires are at a distance$$2d$$apart. They carry steady equal currents flowing out of the plane of the paper as shown. The variation... A current loop$$ABCD$$is held fixed on the plane of the paper as shown in the figure. The arcs$$BC$$(radius$$= b$$) and$$DA$$(radius$$=a$$) of... A current loop$$ABCD$$is held fixed on the plane of the paper as shown in the figure. The arcs$$BC$$(radius$$= b$$) and$$DA$$(radius$$=a$$) of... A horizontal overhead powerline is at height of$$4m$$from the ground and carries a current of$$100A$$from east to west. The magnetic field directl... A charged particle with charge$$q$$enters a region of constant, uniform and mutually orthogonal fields$$\overrightarrow E $$and$$\overrightarrow ...
A current $$I$$ flows along the length of an infinitely long, straight, thin walled pipe. Then
A long straight wire of radius $$a$$ carries a steady current $$i.$$ The current is uniformly distributed across its cross section. The ratio of the ...
A charged particle moves through a magnetic field perpendicular to its direction. Then
Two identical conducting wires $$AOB$$ and $$COD$$ are placed at right angles to each other. The wire $$AOB$$ carries an electric current $${I_1}$$ an...
In a region, steady and uniform electric and magnetic fields are present. These two fields are parallel to each other. A charged particle is released ...
A long solenoid has $$200$$ turns per $$cm$$ and carries a current $$i.$$ The magnetic field at its center is $$6.28 \times {10^{ - 2}}\,\,\,Weber/{m^... Two thin, long, parallel wires, separated by a distance$$'d'$$carry a current of$$'i'A$$in the same direction. They will Two concentric coils each of radius equal to$$2\pi cm$$are placed at right angles to each other.$$3$$ampere and$$4$$ampere are the c... A uniform electric field and a uniform magnetic field are acting along the same direction in a certain region. If an electron is projected along the d... A charged particle of mass$$m$$and charge$$q$$travels on a circular path of radius$$r$$that is perpendicular to a magnetic field$$B.$$The time... A current$$i$$ampere flows along an infinitely long straight thin walled tube, then the magnetic induction at any point inside the tube is A long wire carries a steady current. It is bent into a circle of one turn and the magnetic field at the centre of the coil is$$B.$$It is then bent ... The magnetic field due to a current carrying circular loop of radius$$3cm$$at a point on the axis at a distance of$$4cm$$from the centr... Two long conductors, separated by a distance$$d$$carry current$${I_1}$$and$${I_2}$$in the same direction. They exert a force$$F$$on each other... A particle of mass$$M$$and charge$$Q$$moving with velocity$$\overrightarrow v $$describe a circular path of radius$$R$$when subjected to a uni... A particle of charge$$ - 16 \times {10^{ - 18}}$$coulomb moving with velocity$$10m{s^{ - 1}}$$along the$$x$$-axis enters a region where a magneti... If a current is passed through a spring then the spring will If in a circular coil$$A$$of radius$$R,$$current$$I$$is flowing and in another coil$$B$$of radius$$2R$$a current$$2I$$is flowing, then th... If an electron and a proton having same momentum enter perpendicular to a magnetic field, then The time period of a charged particle undergoing a circular motion in a uniform magnetic field is independent of its Wires$$1$$and$$2$$carrying currents$$i{}_1$$and$$i{}_2$$respectively are inclined at an angle$$\theta  to each other. What is the force on ...
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