The figure below shows a closed loop of wire that consists of a pair of equal se

Question

The figure below shows a closed loop of wire that consists of a pair of equal semicircles, of radius 4.1 cm, lying in mutually perpendicular planes. The loop was formed by folding a flat circular loop along a diameter until the two halves became perpendicular to each other. A uniform magnetic field B of magnitude 100 mT is directed perpendicular to the fold diameter and makes equal angles (of 45degree) with the planes of the semicircles. The magnetic field is reduced to zero at a uniform rate during a time interval of 16 ms. During this interval, what are the (a) magnitude and (b) direction (clockwise or counterclockwise when viewed along the direction of B) of the emf induced in the loop?

Explanation / Answer

we know that emf is given by

E=BAcos(45°)/t

put values in equation and calculate

E =23mV ,

direction will be anticlockwise.

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