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In a coil when current changes from 10A to 2A in time 0.1s, induced emf is 3.28 V. what is self -inductance of coil?
(a)4 H
(b)0.4 H
(c)0.04 H
(d)5 H

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Important Questions on Electromagnetic Induction
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EASY
The magnetic flux linked with a coil (in ) is given by the equation . The magnitude of induced emf in the coil at the fourth second will be:

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An emf in the coil will be generated for the following situations.

HARD
A light disc made of aluminium (a nonmagnetic material) is kept horizontally and is free to rotate about its axis as shown in the figure. A strong magnet is held vertically at a point above the disc away from its axis. On revolving the magnet about the axis of the disc, the disc will (figure is schematic and not drawn to scale)

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EASY

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A small bar magnet is moved through a coil at constant speed from one end to the other. Which of the following series of observations will be seen on the galvanometer attached across the coil?

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EASY

EASY

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EASY

HARD


