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#1 Class 12 Physics Electromagnetic Induction 2021 Short 2M

Predict the polarity of the capacitor C connected to a coil situated between two bar magnets moving towards each other as shown in the figure.

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#2 Class 12 Physics Electromagnetic Induction 2020 Short 2M

Predict the directions of induced currents in metal rings 1 and 2 lying in the same plane, where current $I$ in the wire between them is increasing steadily.

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#3 Class 12 Physics Electromagnetic Induction 2018 Short 1M

A conducting rod of length $l$ is kept parallel to a uniform magnetic field $B$. It is moved along the magnetic field with velocity $v$. What is the value of emf induced in the conductor?

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#4 Class 12 Physics Electromagnetic Induction 2019 Short 2M

A long straight current-carrying wire passes normally through the centre of a circular loop. If the current through the wire increases, will there be an induced emf in the loop? Justify.

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#5 Class 12 Physics Electromagnetic Induction 2021 Short 2M

A 1.0 m metallic rod is rotated with an angular velocity of 400 rad/s about an axis normal to the rod passing through its one end. A constant uniform magnetic field of 0.5 T is parallel to the axis. Calculate the emf ...

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#6 Class 12 Physics Electromagnetic Induction 2020 Short 2M

Two spherical bobs, one metallic and the other of glass, of the same size are allowed to fall freely from the same height. Which of the two would reach the ground earlier and why?

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#7 Class 12 Physics Electromagnetic Induction 2019 Short 2M

Give three possible ways of producing an induced emf in a coil, with an example for each.

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#8 Class 12 Physics Electromagnetic Induction 2019 Short 1M

When is the magnetic flux taken as positive and when as negative?

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#9 Class 12 Physics Electromagnetic Induction 2018 Short 1M

Define the term magnetic flux. Is it a scalar or a vector quantity?

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#10 Class 12 Physics Electromagnetic Induction 2020 Mcq 1M

The direction of induced current in the loop abc (placed near a long current-carrying wire) is

A. along $abc$ if $I$ decreases

B. along $acb$ if $I$ increases

C. along $abc$ if $I$ is constant

D. along $abc$ if $I$ increases

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#11 Class 12 Physics Electromagnetic Induction 2019 Mcq 1M

In a rectangular conductor PSRQ, the movable arm PQ has resistance $r$ and resistance of PSRQ is negligible. The magnitude of emf induced when PQ is moved with velocity $v$ does NOT depend on

A. magnetic field $B$

B. velocity $v$

C. resistance $r$

D. length of PQ

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#12 Class 12 Physics Electromagnetic Induction 2021 Mcq 1M

A circular coil of radius 8.0 cm and 40 turns is rotated about its vertical diameter with angular speed $\frac{25}{\pi}$ rad/s in a uniform horizontal magnetic field of magnitude $3.0 \times 10^{-2}$ T. The maximum em...

A. 0.12 V

B. 0.15 V

C. 0.19 V

D. 0.22 V

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#13 Class 12 Physics Electromagnetic Induction 2022 Mcq 1M

The magnetic flux linked with the coil (in weber) is given by $\Phi = 5t^2 + 3t + 16$. The induced emf in the coil at time $t = 4$ s will be

A. $-27$ V

B. $-43$ V

C. $-108$ V

D. $210$ V

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#14 Class 12 Physics Electromagnetic Induction 2020 Mcq 1M

A conducting square loop of side $L$ and resistance $R$ moves in its plane with uniform velocity $v$ perpendicular to one of its sides. A magnetic field $B$ perpendicular to the plane of the loop exists everywhere. Th...

A. $BLv/R$

B. $BLv/2R$

C. $2BLv/R$

D. zero

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#15 Class 12 Physics Electromagnetic Induction 2019 Mcq 1M

Lenz's law is essential for

A. conservation of energy

B. conservation of mass

C. conservation of momentum

D. conservation of charge

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#16 Class 12 Physics Electromagnetic Induction 2021 Short 2M

A square of side $L$ metres lies in the XY-plane in a region where the magnetic field is $\vec{B} = B_0(2\hat{i} + 3\hat{j} + 4\hat{k})$ T, where $B_0$ is a constant. Find the magnitude of flux passing through the squ...

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#17 Class 12 Physics Electromagnetic Induction 2020 Mcq 1M

An area $A = 0.5$ m$^2$ is situated in a uniform magnetic field $B = 4.0$ Wb/m$^2$ and its normal makes an angle of 60° with the field. The magnetic flux passing through the area $A$ is

A. 2.0 Wb

B. 1.0 Wb

C. $\sqrt{3}$ Wb

D. 0.5 Wb

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#18 Class 12 Physics Electromagnetic Induction 2018 Mcq 1M

Whenever the flux linked with a circuit changes, there is an induced emf in the circuit. This emf lasts

A. for a very short duration

B. for a long duration

C. forever

D. as long as the magnetic flux in the circuit changes

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#19 Class 12 Physics Electromagnetic Induction 2019 Mcq 1M

A 2 m long solenoid with radius 2 cm and 2000 turns has another solenoid of 1000 turns wound closely near its mid-point. The mutual inductance of the solenoids is

A. 0.8 mH

B. 1.6 mH

C. 3.2 mH

D. 6.4 mH

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#20 Class 12 Physics Electromagnetic Induction 2021 Short 2M

A metallic rod of length $l$ is placed normal to the magnetic field $B$ and revolved in a circular path about one of its ends with angular speed $\omega$. Derive the expression for the potential difference across the ...

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