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#1 Class 12 Physics Electromagnetic Induction 2020 Short 2M CBSE

A metre-gauge train is running due north with a constant speed of 90 km/h on a horizontal track. If the vertical component of Earth's magnetic field is $3 \times 10^{-5}$ Wb/m$^2$, find the emf induced across the axle...

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#2 Class 12 Physics Electromagnetic Induction 2023 Short 3M CBSE

A coil is placed in a magnetic field decreasing at a rate of 10 T/s. There is also a source of emf 30 V in the coil (area = 2 m$^2$, resistance $R = 10\ \Omega$). Find the magnitude and direction of the current in the...

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#3 Class 12 Physics Electromagnetic Induction 2022 Short 2M CBSE

An 800-turn coil of effective area $0.05$ m$^2$ is kept perpendicular to a magnetic field $5 \times 10^{-5}$ T. When the plane of the coil is rotated by 90° around any of its coplanar axes in 0.1 s, find the emf induc...

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

A coil of resistance 400 $\Omega$ is placed in a magnetic field. The magnetic flux $\Phi$ (Wb) linked with the coil varies with time $t$ (s) as $\Phi = 50t^2 + 4$. Find the current in the coil at $t = 2$ s.

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#5 Class 12 Physics Electromagnetic Induction 2022 Long 5M CBSE

(a) Define mutual inductance and write its SI unit. (b) Two circular loops, one of small radius $r$ and other of larger radius $R$ ($R \gg r$), are placed coaxially with centres coinciding. Obtain the mutual inductanc...

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#6 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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#7 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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#8 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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#9 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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#10 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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#11 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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#12 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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#13 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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#14 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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#15 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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#16 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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#17 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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#18 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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#19 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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#20 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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