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#1 Class Class 12 Physics Moving Charges and Magnetism 2021 Short 2M

A charged particle of mass $m$ and charge $q$ travels on a circular path of radius $r$ perpendicular to a magnetic field $B$. Write the expression for the time taken by the particle to complete one revolution.

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#2 Class Class 12 Physics Moving Charges and Magnetism 2020 Short 2M

Derive the expression for radius $r$ of the circular path of an electron moving in a perpendicular uniform magnetic field $B$.

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#3 Class Class 12 Physics Moving Charges and Magnetism 2014 Mcq 1M

A current-carrying coil is placed in a uniform magnetic field of induction $B$. The current in the coil is $i$, it has $n$ turns, $A$ is the face area and the normal to the surface makes an angle $\theta$ with $B$. The torque on the coil is

A. $niAB\theta$

B. $niAB\cos\theta$

C. $niAB\sin\theta$

D. $niAB\tan\theta$

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#4 Class Class 12 Physics Moving Charges and Magnetism 2019 Short 2M

A proton moving with a velocity $2.5 \times 10^7$ m/s enters a magnetic field of intensity 2.5 T at an angle of 30° with the magnetic field. Find the force on the proton. (Charge of proton $e = 1.6 \times 10^{-19}$ C)

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#5 Class Class 12 Physics Moving Charges and Magnetism 2022 Mcq 1M

A current passing through a circular coil of 2 turns produces a magnetic field of 8 T at its centre. The coil is rewound to have 4 turns and the current is doubled. The magnetic field at the centre of the new coil will be

A. 64 T

B. 32 T

C. 16 T

D. 8 T

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#6 Class Class 12 Physics Moving Charges and Magnetism 2020 Short 1M

If a current $i$ ampere flows in a long straight thin-walled hollow tube, what is the magnetic field induction at any point inside the tube?

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#7 Class Class 12 Physics Moving Charges and Magnetism 2018 Mcq 1M

A charged particle is released from rest in a region of steady and uniform electric and magnetic fields, which are parallel to each other. The particle will move in a

A. circle

B. helix

C. cycloid

D. straight line

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#8 Class Class 12 Physics Moving Charges and Magnetism 2019 Mcq 1M

When a charged particle moves perpendicular to a magnetic field, then

A. speed of the particle is changed

B. speed of the particle remains unchanged

C. direction of the particle remains unchanged

D. acceleration of the particle remains unchanged

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#9 Class Class 12 Physics Moving Charges and Magnetism 2021 Mcq 1M

A circular coil of radius $r$ carries a current $I$. The magnetic field at its centre is $B$. At what distance from the centre, on the axis of the coil, will the magnetic field be $B/8$?

A. $\sqrt{2}\, r$

B. $2r$

C. $\sqrt{3}\, r$

D. $3r$

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#10 Class Class 12 Physics Current Electricity 2023 Short 3M

From the circuit shown in figure with a 4 V battery:
(a) Calculate the equivalent resistance.
(b) Find magnitude of current in arms AFCED and AFDED.

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#11 Class Class 12 Physics Current Electricity 2021 Short 2M

Find the potential difference $V_A - V_B$ in the circuit shown in figure. (Refer to figure in document for circuit values)

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#12 Class Class 12 Physics Current Electricity 2022 Short 3M

In the circuit shown in figure, find the current through branch BD. (Refer to figure in document for circuit values)

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#13 Class Class 12 Physics Current Electricity 2021 Short 3M

A ring is made of wire having resistance $R_0 = 12\ \Omega$. Find points A and B at which a conductor should be connected so that resistance $R$ of sub-circuit equals $8/3\ \Omega$.

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#14 Class Class 12 Physics Current Electricity 2020 Short 2M

A wire of uniform cross-section, length $L$ and resistance $R$ is bent into a complete circle. Find the resistance between any two diametrically opposite points.

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#15 Class Class 12 Physics Current Electricity 2019 Short 3M

The resistance of a conductor is 6 $\Omega$ at 50°C and 7 $\Omega$ at 100°C. Calculate the mean temperature coefficient $\alpha$ and resistance at 0°C.

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#16 Class Class 12 Physics Current Electricity 2022 Short 3M

A current of 1.8 A flows through a wire of cross-section 0.5 mm$^2$. Find: (a) current density, (b) drift velocity. (Number density $n = 8.8 \times 10^{28}$ m$^{-3}$)

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#17 Class Class 12 Physics Current Electricity 2021 Short 2M

A current of 10 A is maintained in a conductor of cross-section $10^{-4}$ m$^2$. If number density of free electrons is $9 \times 10^{28}$ m$^{-3}$, calculate the drift velocity. ($e = 1.6 \times 10^{-19}$ C)

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#18 Class Class 12 Physics Current Electricity 2020 Short 2M

A wire of resistance 4 $\Omega$ is stretched to twice its original length. What will be the resistance of the stretched wire?

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#19 Class Class 12 Physics Current Electricity 2019 Short 2M

In a hydrogen atom, the electron makes about $0.6 \times 10^{16}$ revolutions per second around the nucleus. Determine the average current at any point on the orbit.

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#20 Class Class 12 Physics Current Electricity 2021 Short 2M

If charge $q = t^2 + 2t$ (in coulombs), find:
(a) Current $i$ at $t = 2$ s
(b) Average current from $t = 0$ to $t = 2$ s

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