The coefficient of mutual induction is $3 \text{ H}$ and induced e.m.f. across secondary is $4 \text{ kV}$. Current in primary is reduced from $7 \text{ A}$ to $2 \text{ A}$. The time required for the change of current is
- A$3.75 \times 10^{-3} \text{ s}$
- B$2.5 \times 10^{-3} \text{ s}$
- C$4.5 \times 10^{-3} \text{ s}$
- D$3.5 \times 10^{-3} \text{ s}$
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