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#1 Class 12 Physics Electromagnetic Induction 2021 Short 2M CBSE
In a coil of resistance 100 $\Omega$, a current is induced by changing the magnetic flux through it. The variation of current with time is as shown in the figure (current decreases linearly from 0.5 A to 0 in 0.2 s). ...
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#2 Class 12 Physics Electromagnetic Induction 2023 Long 5M CBSE
Explain briefly, with the help of a labelled diagram, the basic principle of working of an AC generator. Derive an expression for the instantaneous value of emf induced in a coil of $N$ turns, area $A$, rotating at an...
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#3 Class 12 Physics Electromagnetic Induction 2023 Short 3M CBSE
A conducting coil of 50 turns and area $\frac{5}{\pi}$ cm$^2$ is rotating along the axis of a solenoid of length 50 cm and 2000 turns, carrying a current of 5 A. What will be the value of maximum emf generated?
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#4 Class 12 Physics Electromagnetic Induction 2022 Short 3M CBSE
A solenoid has a core of material with relative permeability 200. The windings carry a current of 1 A and the number of turns is 2000 per metre. Calculate: (A) magnetic intensity $H$, (B) magnetic field $B$, (C) magne...
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#5 Class 12 Physics Electromagnetic Induction 2022 Mcq 1M CBSE
Two small identical magnets are allowed to fall freely — one through a vertical solenoid made of copper and another in air through the same distance. The time taken by the two magnets to fall will be
A. same in both cases
B. more for the magnet falling in air
C. more for the magnet falling through the solenoid
D. infinite
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#6 Class 12 Physics Electromagnetic Induction 2021 Short 2M CBSE
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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#7 Class 12 Physics Electromagnetic Induction 2020 Short 2M CBSE
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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#8 Class 12 Physics Electromagnetic Induction 2018 Short 1M CBSE
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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#9 Class 12 Physics Electromagnetic Induction 2019 Short 2M CBSE
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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#10 Class 12 Physics Electromagnetic Induction 2021 Short 2M CBSE
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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#11 Class 12 Physics Electromagnetic Induction 2020 Short 2M CBSE
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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#12 Class 12 Physics Electromagnetic Induction 2019 Short 2M CBSE
Give three possible ways of producing an induced emf in a coil, with an example for each.
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#13 Class 12 Physics Electromagnetic Induction 2019 Short 1M CBSE
When is the magnetic flux taken as positive and when as negative?
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#14 Class 12 Physics Electromagnetic Induction 2018 Short 1M CBSE
Define the term magnetic flux. Is it a scalar or a vector quantity?
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#15 Class 12 Physics Electromagnetic Induction 2020 Mcq 1M CBSE
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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#16 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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#17 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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#18 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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#19 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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#20 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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