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Q.

The coefficient of mutual induction between two coils is 4H. If the current in the primary reduces from 5A to zero in 10–3 second then the induced e.m.f in the secondary coil will be

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a

25 × 103V

b

2 × 104V

c

15 × 103V

d

104V

answer is C.

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Detailed Solution

ES=MdIdt;ES=4×510−3;ES=2×104 volt  

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