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#1 Class 12 Physics Electromagnetic Induction 2019 Mcq 1M CBSE

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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#2 Class 12 Physics Electromagnetic Induction 2021 Mcq 1M CBSE

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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#3 Class 12 Physics Electromagnetic Induction 2022 Mcq 1M CBSE

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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#4 Class 12 Physics Electromagnetic Induction 2020 Mcq 1M CBSE

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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#5 Class 12 Physics Electromagnetic Induction 2019 Mcq 1M CBSE

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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#6 Class 12 Physics Electromagnetic Induction 2021 Short 2M CBSE

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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#7 Class 12 Physics Electromagnetic Induction 2020 Mcq 1M CBSE

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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#8 Class 12 Physics Electromagnetic Induction 2018 Mcq 1M CBSE

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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#9 Class 12 Physics Electromagnetic Induction 2019 Mcq 1M CBSE

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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#10 Class 12 Physics Electromagnetic Induction 2021 Short 2M CBSE

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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#11 Class 12 Physics Electromagnetic Induction 2020 Mcq 1M CBSE

The mutual inductance, when the magnetic flux changes by $5 \times 10^{-2}$ Wb and current changes by 0.01 A, is

A. 0.2 H

B. 2.5 H

C. 5 H

D. 10 H

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#12 Class 12 Physics Magnetism and Matter 2023 Long 5M CBSE

Explain the domain theory of ferromagnetic substances. Also write down its properties.

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#13 Class 12 Physics Magnetism and Matter 2023 Short 3M CBSE

An iron rod of cross-sectional area $0.5$ cm$^2$ is subjected to a magnetising field of 1200 A·m$^{-1}$. If susceptibility of iron is 599, calculate: (1) $\mu$ (permeability), (2) $B$ (magnetic flux density), (3) $\Ph...

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#14 Class 12 Physics Magnetism and Matter 2022 Short 3M CBSE

The permeability of a metal is measured to be $0.12$ T·A$^{-1}$·m. Find its relative permeability $\mu_r$ and susceptibility $\chi_m$.

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#15 Class 12 Physics Magnetism and Matter 2021 Short 2M CBSE

Calculate the work done in rotating a bar magnet of magnetic moment 3 J·T$^{-1}$ through an angle of 60° from its position along a magnetic field of strength $0.34 \times 10^{-4}$ T.

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#16 Class 12 Physics Magnetism and Matter 2020 Short 3M CBSE

A bar magnet of length 0.1 m has a pole strength of 50 A·m. Calculate the magnetic field at a distance of 0.2 m from its centre on: (i) its axial line, (ii) its equatorial line.

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#17 Class 12 Physics Magnetism and Matter 2022 Short 2M CBSE

A bar magnet of length $L$ and magnetic dipole moment $M$ is bent in the form of an arc subtending an angle of 60° at its centre. What will be the new magnetic dipole moment?

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#18 Class 12 Physics Magnetism and Matter 2021 Short 3M CBSE

A current of 7.0 A flows in a plane circular coil of radius 10 cm having 100 turns placed in a uniform magnetic field of 0.2 Wb·m$^{-2}$. What orientations correspond to (1) stable equilibrium and (2) unstable equilib...

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#19 Class 12 Physics Magnetism and Matter 2022 Short 3M CBSE

Two identical magnetic dipoles of magnetic moment 1.0 A·m$^2$ each are placed at a separation of 2 m with their axes perpendicular to each other. Find the resultant magnetic field at the point mid-way between the dipo...

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#20 Class 12 Physics Magnetism and Matter 2021 Short 2M CBSE

A bar magnet of magnetic moment 6.4 A·m$^2$ is placed in a uniform magnetic field of 0.4 T. What is the torque acting on the magnet when its axis makes an angle of 60° with the magnetic field?

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