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Q.

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

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a

3A0B0t

b

4A0B0t

c

3B0A0t

d

4B0A0t

answer is A.

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e=−dϕdt=−3B0A0t
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