Moving Charges and Magnetism · Physics · AP EAPCET

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MCQ (Single Correct Answer)

1
When an electron placed in a uniform magnetic field is accelerated from rest through a potential difference $V_1$. It experiences a force $F$. If the potential difference is changed to $V_2$, the force experienced by the electron in same magnetic field is $2 F$, then the ratio of potential differences $\frac{V_2}{V_1}$ is
AP EAPCET 2024 - 21th May Morning Shift
2
A rectangular loop of sides 25 cm and 10 cm carrying a current of 10 A is placed with its longer side parallel to a long straight conductor 10 cm apart carrying current 25 A . The net force on the loop is
AP EAPCET 2024 - 21th May Morning Shift
3
Two long straight parallel conductors $A$ and $B$ carrying currents 4.5 A and 8 A respectively, are separated by 25 cm in air. The resultant magnetic field at a point which is at a distance of 15 cm from conductor $A$ and 20 cm from conductor $B$ is
AP EAPCET 2024 - 20th May Evening Shift
4
Two concentric thin circular rings of radii 50 cm and 40 cm , each carry a current of 3.5 A in opposite directions. If the two rings are coplanar, the net magnetic field due to the rings at their centre is
AP EAPCET 2024 - 20th May Evening Shift
5
In hydrogen atom an electron is making $6.6 \times 10^{15} \mathrm{rev} / \mathrm{s}$ around the nucleus of radius $0.47 $$\mathop A\limits^o $. The magnetic field induction produced at the centre of the orbit is nearly.
AP EAPCET 2024 - 20th May Morning Shift
6
When two coaxial coils having same current in same direction are brought to each other, then the value of current in both the coils
AP EAPCET 2024 - 20th May Morning Shift
7
A wire shaped in a regular hexagon of side 2 cm carries a current of 4 A . The magnetic field at the centre of hexagon is AP EAPCET 2024 - 19th May Evening Shift Physics - Moving Charges and Magnetism Question 9 English
AP EAPCET 2024 - 19th May Evening Shift
8
A tightly wound coil of 200 turns and of radius 20 cm carrying current 5 A . Magnetic field at the centre of the coil is
AP EAPCET 2024 - 19th May Evening Shift
9
A current carrying coil experiences a torque due to a magnetic field. The value of the torque is $80 \%$ of the maximum possible torque. The angle between the magnetic field and the normal to the plane of the coil is
AP EAPCET 2024 - 18th May Morning Shift
10
An electron in moving with a velocity $\left[\mathbf{i}+3 \hat{\mathbf{j}} \mathrm{~ms}^{-1}\right.$ in an electric field $(\hat{\mathbf{i}}+6 \hat{\mathbf{j}}+2 \hat{\mathbf{k}}) \mathrm{Vm}^{-1}$ and a magnetic field of $(\Omega \mathbf{j}+3 \mathbf{k})$ T. Then, the magnitude and direction (with $X$-axis) of the Lorentz force acting on the electron is
AP EAPCET 2024 - 18th May Morning Shift
11

An electron having kinetic energy of 100 eV circulates in a path of radius 10 cm in a magnetic field. The magnitude of magnetic field $$|\mathbf{B}|$$ is approximately [Mass of electron $$=0.5 \mathrm{~MeV} \mathrm{c}^{-2}$$, where c is the velocity of light].

AP EAPCET 2022 - 5th July Morning Shift
12

A particle of mass $$2.2 \times 10^{-30} \mathrm{~kg}$$ and charge $$1.6 \times 10^{-19} \mathrm{C}$$ is moving at a speed of $$10 \mathrm{~km} \mathrm{~s}^{-1}$$ in a circular path of radius 2.8 cm inside a solenoid. The solenoid has $$25 \frac{\text { turns }}{\mathrm{cm}}$$ and its magnetic field is perpendicular to the plane of the particle's path. The current in the solenoid is

(Take, $$\mu_0=4 \pi \times 10^{-7} \mathrm{~Hm}^{-1}$$)

AP EAPCET 2022 - 5th July Morning Shift
13

A toroid has a non ferromagnetic core of inner radius 24 cm and outer radius 25 cm , around which 4900 turns of a wire are wound. If the current in the wire is 12 A , the magnetic field inside the core of the toroid is

AP EAPCET 2022 - 4th July Evening Shift
14

Two infinitely long wires each carrying the same current and pointing in $$+y$$ direction are placed in the $$x y$$-plane, at $$x=-2 \mathrm{~cm}$$ and $$x=1 \mathrm{~cm}$$. An electron is fired with speed $$u$$ from the origin making an angle of $$+45^{\circ}$$ from the $$X$$-axis. The force on the electron at the instant it is fired is

[$$B_0$$ is the magnitude of the field at origin due to the wire at $$x=1 \mathrm{~cm}$$ alone].

AP EAPCET 2022 - 4th July Morning Shift
15

Two electrons, $$e_1$$ and $$e_2$$ of mass $$m$$ and charge $$q$$ are injected into the perpendicular direction of the magnetic field $$B$$ such that the kinetic energy of $$e_1$$ is double than that of $$e_2$$. The relation of their frequencies of rotation, $$f_1$$ and $$f_2$$ is

AP EAPCET 2022 - 4th July Morning Shift
16

A wire of length $$L$$ metre carrying a current $$I$$ ampere is bent in the form of a circle. Magnitude of its magnetic moment is

AP EAPCET 2021 - 20th August Morning Shift
17

What is the net force on the square coil?

AP EAPCET 2021 - 20th August Morning Shift Physics - Moving Charges and Magnetism Question 17 English

AP EAPCET 2021 - 20th August Morning Shift
18

In a co-axial, straight cable, the central conductor and the outer conductor carry equal currents in opposite directions. The magnetic field is zero

AP EAPCET 2021 - 19th August Evening Shift
19

The magnetic field, of a given length of wire for single turn coil, at its centre is B, then its value for two turns coil for the same wire is

AP EAPCET 2021 - 19th August Evening Shift
20

In which of the following case no force exerted by a magnetic field on a charge?

AP EAPCET 2021 - 19th August Morning Shift
21

A long thin hollow metallic cylinder of radius R has a current i ampere. The magnetic induction B away from the axis at a distance r from the axis varies as shown in

AP EAPCET 2021 - 19th August Morning Shift Physics - Moving Charges and Magnetism Question 21 English 1AP EAPCET 2021 - 19th August Morning Shift Physics - Moving Charges and Magnetism Question 21 English 2

AP EAPCET 2021 - 19th August Morning Shift
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