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Question

Square loop ABCD of area 20cm2 and resistance 5Ω is rotated in a magnetic field B = 2T through 180, with field perpendicualr to the loop initially. In 0.01 seconds the magnitude of induced e.m.f is …………….

A
0.4 V
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B
0.8 V
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C
0.6 V
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D
1.0 V
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Solution

The correct option is B 0.8 V
e=BAN(cosθ1cosθ2)t
=(2×20×104×[1(1)]0.01
=0.8V

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