The voltage induced in a conductor rotating in a magnetic field is alternating in nature Imagine the coil to be rotating in clock wise direction. We know an e. m. f. is induced in it which is proportional to the rate of change of flux linkages. When the plane of the coil is at right angles to lines of flux i.e. when it is in position, 1, then flux linked with the coil is maximum but rate of change of flux linkage is minimum. As the coil continues rotating further, the rate of change of flux linkage increases, till position 3 is reached where Ѳ=90. But at position 1, where Ѳ=0 the flux linked with the coil is minimum. In the next quarter revolution i.e. from 90 to 180, the flux linked with the coil gradually increase but the rate of flux linkages decreases. Hence, the induced e. m. f. decreases gradually till position 5 of the coil; it is reduced to zero value. So, we find that in the first half revolution of the coil , no (or minimum) e. m. f. is induced in i
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