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Q.

A coil. having an area A0 is placed in a magnetic field which changes from B0 to 4B0 in time interval t. The e.m.f. induced in the coil will be

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a

4 A0B0 / t

b

3 B0 / A0 t

c

3 A0B0 / t

d

4 B0 / A0 t

answer is A.

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Detailed Solution

e=dΦdt=dBAdt=A0dBdt=A04B0−B0t=3A0B0/t

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