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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 tothe length of magnet. In which case will there be an induced e.m.f. at the terminals of the coil?29.CoilCoilNScase (a)case (b)(1) case (a)(3) both case (a) and case (b)(2) case (b)(4) Neither case (a) nor case (b) |
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Answer» We know magnet is placed along the axis of the circular coil, hence axis of the magnet is parallel to the axis of the circular coil.1) When magnet is rotated about its own axis then there will be very negligiblechange in the flux linked with the coil. Hence EMF induced is less. 2) IN the second case as magnet is rotated in perpendicular direction then flux linked with the coil decreases then become zero and then again increases and reached to the maximum value.Hence emf induced is more in this case.option 3 |
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