The coefficient of mutual induction is $2 \ H$ and the induced e.m.f. across the secondary coil is $2 \ kV$. The current in the primary coil is reduced from $6 \ A$ to $3 \ A$. The time required for the change of current is:
- A$3 \times 10^{-3} \ s$
- B$3 \times 10^{-2} \ s$
- C$6 \times 10^{-3} \ s$
- D$1 \times 10^{-3} \ s$
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