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A coil having an area 2m2 is placed in a magnetic field which changes from 1 Wb/m2 to 4 Wb/m2 in an interval of 2 seconds. The average e.m.f induced in the coil will be

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a

4V

b

3V

c

1.5V

d

2V

answer is B.

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Detailed Solution

A=2m2, B1=1 wb/m2, B2=4wb/m2, t=2s e=−A(B2−B1)te=2(4−1)2=3V

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