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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

10⁴V

b

25 × 10³V

c

2 × 10⁴V

d

15 × 10³V

answer is C.

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Detailed Solution

$\begin{array}{l} E_{S} = M \frac{dI}{dt}; E_{S} = 4 \times \frac{5}{10^{- 3}}; E_{S} = 2 \times 10^{4} volt \end{array}$

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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