A cylindrical bar magnet is kept along the axis of a circular coil and near it as shown in figure. The magnet is rotated in case (a) about its own axis and in case (b) about axis perpendicular to the length of magnet. In which case will there be an induced e.m.f. at the terminals of the coil ?
(1) case (a)
(2) case (b)
(3) both case (a) and case (b)
(4) Neither case (a) nor case (b)
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Both case a and b
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Answer:
Explanation:
The answer of this question will be option B that is
The magnet is rotated about axis perpendicular to the length of magnet in this case e.m.f. will induced at the terminals of the coil.
Explanation- when magnet is rotated about it own axis so because of symmetry of magnet the magnetic flux related with circular coil doesn't changes and it remains unchanged.
So emf is not induced in this case.
Where is when magnet is rotated about the axis perpendicular to the length of magnet, then the south and north pole of the magnet continuously changes show the magnetic flux related to the coil also continuously changes ,hence in this case EMF is induced.
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