Moving Charges and Magnetism · Physics · MHT CET

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MCQ (Single Correct Answer)

MHT CET 2024 10th May Morning Shift
A circular arc of radius r carrying current ' I ' subtends an angle $\frac{\pi}{8}$ at its entre. The radius of a metal wire is uniform. The magnetic ...
MHT CET 2024 10th May Morning Shift
Electron of mass ' $m$ ' and charge ' $q$ ' is travelling with speed ' $v$ ' along a circular path of radius ' $R$ ' at right angles to a uniform magn...
MHT CET 2024 9th May Evening Shift
A current carrying circular loop of radius ' $R$ ' and current carrying long straight wire are placed in the same plane. $I_c$ and $I_w$ are the curre...
MHT CET 2024 9th May Evening Shift
A long solenoid carrying a current produces magnetic field B along its axis. If the number of turns per cm are tripled and the current is made $\left(...
MHT CET 2024 9th May Evening Shift
The magnetic potential energy stored in certain inductor is $64 \times 10^{-3} \mathrm{~J}$, when the current in the inductor is 80 mA . This inductor...
MHT CET 2024 9th May Morning Shift
The magnetic induction due to an ideal solenoid is independent of
MHT CET 2024 9th May Morning Shift
The magnetic field intensity inside current carrying solenoid is $\mathrm{H}=2.4 \times 10^3 \mathrm{~A} / \mathrm{m}$. If length and number of turns ...
MHT CET 2024 4th May Evening Shift
A particle carrying a charge equal to 100 times the charge on an electron is rotating one rotation per second in a circular path of radius 0.8 m . The...
MHT CET 2024 4th May Morning Shift
A charged particle of charge ' $q$ ' is accelerated by a potential difference ' $V$ ' enters a region of uniform magnetic field ' $B$ ' at right angle...
MHT CET 2024 4th May Morning Shift
A charged particle is moving in a uniform magnetic field in a circular path with radius ' $R$ '. When the energy of the particle is doubled, then the ...
MHT CET 2024 4th May Morning Shift
A massless square loop of wire of resistance ' $R$ ' supporting a mass ' M ' hangs vertically with one of its sides in a uniform magnetic field ' B ' ...
MHT CET 2024 3rd May Evening Shift
A thin ring of radius ' $R$ ' carries a uniformly distributed charge. The ring rotates at constant speed ' $N$ ' r.p.s. about its axis perpendicular t...
MHT CET 2024 3rd May Evening Shift
A charged particle is moving along a magnetic field line. What is the magnetic force acting on the particle? $\left(\sin 0^{\circ}=0, \sin \frac{\pi}{...
MHT CET 2024 3rd May Morning Shift
A current of 5 A flows through a toroid having a core of mean radius 20 cm . If 4000 turns of the conducting wire are wound on the core, then the magn...
MHT CET 2024 3rd May Morning Shift
A particle having a charge 50 e is revolving in a circular path of radius 0.4 m with $1 \mathrm{r} . \mathrm{p} . \mathrm{s}$. The magnetic field prod...
MHT CET 2024 2nd May Evening Shift
Three long, straight parallel wires carrying currents are arranged as shown. The wire C which carries a current of 5.0 A is so placed that it experien...
MHT CET 2024 2nd May Evening Shift
Cyclotron is used to
MHT CET 2024 2nd May Morning Shift
The magnetic field at the centre of a current carrying circular coil of area ' $A$ ' is ' $B$ '. The magnetic moment of the coil is ( $\mu_0=$ permeab...
MHT CET 2024 2nd May Morning Shift
Two identical current carrying coils with same centre are placed with their planes perpendicular to each other. If current $\mathrm{I}=\sqrt{2} \mathr...
MHT CET 2023 14th May Evening Shift
Figure shows two semicircular loops of radii $$R_1$$ and $$R_2$$ carrying current $I$. The magnetic field at the common centre '$$\mathrm{O}$$' is ...
MHT CET 2023 14th May Evening Shift
A long wire is bent into a circular coil of one turn and then into a circular coil of smaller radius having $$\mathrm{n}$$ turns. If the same current ...
MHT CET 2023 14th May Morning Shift
A horizontal wire of mass '$$m$$', length '$$l$$' and resistance '$$R$$' is sliding on the vertical rails on which uniform magnetic field '$$B$$' is d...
MHT CET 2023 14th May Morning Shift
A straight wire carrying a current (I) is turned into a circular loop. If the magnitude of the magnetic moment associated with it is '$$M$$', then the...
MHT CET 2023 14th May Morning Shift
A solenoid of length $$0.4 \mathrm{~m}$$ and having 500 turns of wire carries a current $$3 \mathrm{~A}$$. A thin coil having 10 turns of wire and rad...
MHT CET 2023 14th May Morning Shift
Two circular coils made from same wire but radius of $$1^{\text {st }}$$ coil is twice that of $$2^{\text {nd }}$$ coil. If magnetic field at their ce...
MHT CET 2023 13th May Evening Shift
The ratio of magnetic field at the centre of the current carrying circular loop and magnetic moment is $$X$$. When both the current and radius are dou...
MHT CET 2023 13th May Evening Shift
A circular current carrying coil has radius $$R$$. The magnetic induction at the centre of the coil is $$B_C$$. The magnetic induction of the coil at ...
MHT CET 2023 13th May Morning Shift
A circular coil of radius '$$r$$' and number of turns ' $n$ ' carries a current '$$I$$'. The magnetic fields at a small distance '$$h$$' along the axi...
MHT CET 2023 13th May Morning Shift
Two concentric circular coils A and B have radii $$20 \mathrm{~cm}$$ and $$10 \mathrm{~cm}$$ respectively lie in the same plane. The current in coil A...
MHT CET 2023 12th May Evening Shift
Two concentric circular coils of 10 turns each are situated in the same plane. Their radii are $$20 \mathrm{~cm}$$ and $$40 \mathrm{~cm}$$ and they ca...
MHT CET 2023 12th May Evening Shift
A coil of '$$n$$' turns and radius '$$R$$' carries a current '$$I$$'. It is unwound and rewound again to make another coil of radius $$\left(\frac{\ma...
MHT CET 2023 12th May Evening Shift
An electron makes a full rotation in a circle of radius $$0.8 \mathrm{~m}$$ in one second. The magnetic field at the centre of the circle is $$\left(\...
MHT CET 2023 12th May Morning Shift
$$\mathrm{A}, \mathrm{B}$$ and $$\mathrm{C}$$ are three parallel conductors of equal lengths and carry currents I, I and 2I respectively as shown in f...
MHT CET 2023 12th May Morning Shift
The magnetic moment of a current (I) carrying circular coil of radius '$$r$$' and number of turns '$$n$$' depends on
MHT CET 2023 12th May Morning Shift
Two similar coils each of radius $$\mathrm{R}$$ are lying concentrically with their planes at right angles to each other. The current flowing in them ...
MHT CET 2023 12th May Morning Shift
A single turn current loop in the shape of a right angle triangle with side $$5 \mathrm{~cm}, 12 \mathrm{~cm}, 13 \mathrm{~cm}$$ is carrying a current...
MHT CET 2023 11th May Evening Shift
Two long conductors separated by a distance '$$\mathrm{d}$$' carry currents $$I_1$$ and $$I_2$$ in the same direction. They exert a force '$$F$$' on e...
MHT CET 2023 11th May Evening Shift
A circular arc of radius '$$r$$' carrying current '$$\mathrm{I}$$' subtends an angle $$\frac{\pi}{16}$$ at its centre. The radius of a metal wire is u...
MHT CET 2023 11th May Morning Shift
A cylindrical magnetic rod has length $$5 \mathrm{~cm}$$ and diameter $$1 \mathrm{~cm}$$. It has uniform magnetization $$5.3 \times 10^3 \mathrm{~A} /...
MHT CET 2023 11th May Morning Shift
Two parallel wires of equal lengths are separated by a distance of $$3 \mathrm{~m}$$ from each other. The currents flowing through $$1^{\text {st }}$$...
MHT CET 2023 11th May Morning Shift
An electron is projected along the axis of circular conductor carrying current I. Electron will experience
MHT CET 2023 10th May Evening Shift
The magnetic field at the centre of a circular coil of radius '$$R$$', carrying current $$2 A$$ is '$$B_1$$'. The magnetic field at the centre of anot...
MHT CET 2023 10th May Evening Shift
Two wires $$2 \mathrm{~mm}$$ apart supply current to a $$100 \mathrm{~V}, 1 \mathrm{~kW}$$ heater. The force per metre between the wires is ( $$\mu_0=...
MHT CET 2023 10th May Morning Shift
Two long parallel wires carrying currents $$8 \mathrm{~A}$$ and $$15 \mathrm{~A}$$ in opposite directions are placed at a distance of $$7 \mathrm{~cm}...
MHT CET 2023 10th May Morning Shift
Electron of mass '$$\mathrm{m}$$' and charge '$$\mathrm{q}$$' is travelling with speed '$$v$$' along a circular path of radius '$$R$$', at right angle...
MHT CET 2023 9th May Evening Shift
10 A current is flowing in two straight parallel wires in the same direction. Force of attraction between them is $$1 \times 10^{-3} \mathrm{~N}$$. If...
MHT CET 2023 9th May Evening Shift
The magnetic field at a point $$\mathrm{P}$$ situated at perpendicular distance '$$R$$' from a long straight wire carrying a current of $$12 \mathrm{~...
MHT CET 2023 9th May Morning Shift
A long straight wire carrying a current of $$25 \mathrm{~A}$$ rests on the table. Another wire PQ of length $$1 \mathrm{~m}$$ and mass $$2.5 \mathrm{~...
MHT CET 2022 11th August Evening Shift
Two parallel conducting wires of equal length are placed distance 'd' apart, carry currents '$$\mathrm{I}_1$$' and '$$\mathrm{I}_2$$' respectively in ...
MHT CET 2022 11th August Evening Shift
An electron and a proton having the same momenta enter perpendicularly into a magnetic field. What are their trajectories in the field?
MHT CET 2021 24th September Evening Shift
A solenoid 2 m long and 4 cm in diameter has 4 layers of windings of 1000 turns each and carries a current of 5 A. What is the magnetic field at its c...
MHT CET 2021 24th September Evening Shift
A particle of charge 'q' and mass 'm' moves in a circular orbit of radius 'r' with angular speed '$$\omega$$'. The ratio of the magnitude of its magne...
MHT CET 2021 24th September Morning Shift
A current carrying loop is placed in a uniform magnetic field. The torque acting on the loop does not depend upon
MHT CET 2021 24th September Morning Shift
Two long conductors, separated by a distance '$$\mathrm{d}$$' carry currents '$$\mathrm{I}_1$$' and '$$\mathrm{I}_2$$' in the same directions. They ex...
MHT CET 2021 23rd September Evening Shift
An electron in a circular orbit of radius $$0.05 \mathrm{~nm}$$ performs $$10^{14}$$ revolutions/second. What is the magnetic moment due to the rotati...
MHT CET 2021 23rd September Evening Shift
A long solenoid carrying current $$\mathrm{I}_1$$ produces magnetic field $$\mathrm{B}_1$$ along its axis. If the current is reduced to $$20 \%$$ and ...
MHT CET 2021 23rd September Evening Shift
A straight wire of diameter $$0.4 \mathrm{~mm}$$ carrying a current of $$2 \mathrm{~A}$$ is replaced by another wire of 0.8 $$\mathrm{mm}$$ diameter c...
MHT CET 2021 23th September Morning Shift
An electron is projected along the axis of circular conductor carrying current '$$\mathrm{I}$$' The electron will experience
MHT CET 2021 23th September Morning Shift
A thin ring of radius '$$R$$' meter has charge '$$q$$' coulomb uniformly spread on it. The ring rotates about its axis with a constant frequency of $$...
MHT CET 2021 22th September Evening Shift
A particle having a charge $$100 \mathrm{e}$$ is revolving in a circular path of radius $$0.8 \mathrm{~m}$$ with 1. r.p.s The magnetic field produced ...
MHT CET 2021 22th September Evening Shift
The magnetic field inside a current carrying toroidal solenoid is $$0.2 \mathrm{~mT}$$. What is the magnetic field inside the toroid if the current th...
MHT CET 2021 22th September Morning Shift
When a battery is connected to the two ends of a diagonal of a square conductor frame of side '$$a$$', the magnitude of magnetic field at the centre w...
MHT CET 2021 22th September Morning Shift
Two concentric coplanar circular loops of radii '$$r{ }_1$$' and '$$r_2$$' respectively carry currents '$$i_1$$' and '$$\mathrm{i}_2$$' in opposite di...
MHT CET 2021 22th September Morning Shift
Assuming the atom is in the ground state, the expression for the magnetic field at a point nucleus in hydrogen atom due to circular motion of electron...
MHT CET 2021 21th September Evening Shift
A, B and C are three parallel conductors of equal lengths carrying currents $$\mathrm{I}, \mathrm{I}$$ and $$2 \mathrm{I}$$ respectively. Distance bet...
MHT CET 2021 21th September Evening Shift
Magnetic moment of revolving electron of charge (e) and mass (m) in terms of angular momentum (L) of electron is :
MHT CET 2021 21th September Evening Shift
The magnetic flux near the axis and inside the air core solenoid of length $$60 \mathrm{~cm}$$ carrying current '$$\mathrm{I}$$' is $$1.57 \times 10^{...
MHT CET 2021 21th September Morning Shift
A charge moves with velocity '$$V$$' through electric field $$(E)$$ as well as magnetic field (B). then the force acting on it is
MHT CET 2021 21th September Morning Shift
A long solenoid carrying a current produces a magnetic field B along its axis. If the number of turns per $$\mathrm{cm}$$ is doubled and the current i...
MHT CET 2021 20th September Evening Shift
A metal conductor of length $$1 \mathrm{~m}$$ rotates vertically about one of its ends at an angular velocity of $$5 \mathrm{~rad} / \mathrm{s}$$. If ...
MHT CET 2021 20th September Evening Shift
Two wires carrying currents $$5 \mathrm{~A}$$ and $$2 \mathrm{~A}$$ are enclosed in a circular loop as shown in the figure. Another wire carrying a cu...
MHT CET 2021 20th September Evening Shift
The magnetic field at the centre of a current carrying circular coil of area 'A' is 'B'. The magnetic moment of the coil is ( $$\mu_0=$$ permeability ...
MHT CET 2021 20th September Evening Shift
The relation between magnetic moment 'M' of revolving electron and principle quantum number 'n' is
MHT CET 2021 20th September Morning Shift
If the charge to ratio of an electron is 'A' C/kg, then the gyromagnetic ratio of an orbital electron in C/kg is
MHT CET 2021 20th September Morning Shift
The magnetic field intensity 'H' at the centre of a long solenoid having 'n' turns per unit length and carrying a current 'I', when no material is kep...
MHT CET 2021 20th September Morning Shift
An electron (e) moves in circular orbit of radius 'r' with uniform speed 'V'. It produces magnetic field 'B' at the centre of circle. The magnetic fie...
MHT CET 2020 19th October Evening Shift
An electron moves in a circular orbit with uniform speed $v$. It produces a magnetic field $B$ at the centre of the circle. The radius of the circle i...
MHT CET 2020 16th October Evening Shift
A circular coil of radius $$R$$ is carrying a current $$I_1$$ in anti-clockwise sense. A long straight wire is carrying current $$I_2$$ in the negativ...
MHT CET 2020 16th October Evening Shift
An $$\alpha$$-particle of energy 10 eV is moving in a circular path in uniform magnetic field. The energy of proton moving in the same path and same m...
MHT CET 2020 16th October Morning Shift
An electron $$(e)$$ is revolving in a circular orbit of radius $$r$$ in hydrogen atom. The angular momentum of the electron is ($$M=$$ magnetic dipole...
MHT CET 2020 16th October Morning Shift
A charged particle is moving in a uniform magnetic field in a circular path of radius $$R$$. When the energy of the particle becomes three times the o...
MHT CET 2020 16th October Morning Shift
A charge $$q$$ moves with velocity $$v$$ through electric field $$\mathrm{E}$$ as well as magnetic field (B). Then, the force acting on it is
MHT CET 2019 3rd May Morning Shift
Maximum kinetic energy gained by the charged particle in the cyclotron is independent of
MHT CET 2019 3rd May Morning Shift
In a hydrogen atom, an electron of charge $e$ revolves in a orbit of radius $r$ with speed $v$. Then, magnetic moment associated with electron is...
MHT CET 2019 3rd May Morning Shift
Six very long insulated copper wires are bound together to form a cable. The currents carried by the wires are $I_1=+10 \mathrm{~A}, I_2=-13 \mathrm{~...
MHT CET 2019 3rd May Morning Shift
A circular coil and a square coil is prepared from two identical metal wires and a current is passed through it. Ratio of magnetic dipole moment assoc...
MHT CET 2019 3rd May Morning Shift
Figure show the circular coil carrying current $I$ kept very close but not touching at a point $A$ on a straight conductor carrying the same current $...
MHT CET 2019 2nd May Evening Shift
Torque acting on a rectangular coil carrying current ' $l$ ' situated parallel to magnetic field of induction ' $B$ ', having number of turns ' $n$ ' ...
MHT CET 2019 2nd May Evening Shift
A circular coil of wire consisting of 100 turns each of radius 9 cm carries a current of 0.4 A . The magnitude of the magnetic field at the centre of ...
MHT CET 2019 2nd May Evening Shift
The magnetic dipole moment of a short magnetic dipole at a distant point along the equator of magnet has a magnitude of ' $X$ ' in SI units. If the di...
MHT CET 2019 2nd May Morning Shift
Two parallel conductors carrying unequal currents in the same direction ............
MHT CET 2019 2nd May Morning Shift
The magnitude of the magnetic induction at a point on the axis at a large distance ( $r$ ) from the centre of a circular coil of ' $n$ ' turns and are...
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