Q.

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

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a

4 V

b

3 V

c

1.5 V

d

2 V

answer is B.

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Detailed Solution

|e|=A⋅ΔBΔt=2×(4−1)2=3V
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A coil having an area  2m2 is placed in a magnetic field which changes from 1Wb/m2 to 4Wb/m2 in a interval of 2 second. The e.m.f. induced in the coil will be