The figure shows a bar magnet coil. Consider four situations.
(I) Moving the magnet away from the coil.
(II) Moving the coil towards the magnet.
(III) Rotating the coil about the vertical diameter.
(IV) Rotating the coil about its axis.
An emf in the coil will be generated for the following situations.

(I) and (II) only

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(I), (II) and (IV) only

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(I), (II) and (III) only

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(I), (II), (III) and (IV) only

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Solution

The correct option is C (I), (II) and (III) only
To generate EMF we should have magnetic flux which changes with time. So when ever coil is moves away or close the flux will vary with time. Also rotating coil about vertical diameter will result in projected area and flux will change but when it is rotated about the axis then area and flux remain same .So the option 1,2 and 3 is correct.

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The figure shows a bar magnet coil. Consider four situations.(I) Moving the magnet away from the coil.(II) Moving the coil towards the magnet.(III) Rotating the coil about the vertical diameter.(IV) Rotating the coil about its axis.An emf in the coil will be generated for the following situations.