What is the self-inductance of a coil in which an induced emf of $2 \,V$ is set up, when the current is changing at the rate of $4 \,A s^{-1}$?
- A$0.5 \,mH$
- B$0.05 \,H$
- C$2 \,H$
- D$0.5 \,H$
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