$12 \mathrm{~V}$ battery connected to a coil of resistance $6 \Omega$ through a switch, drives a constant current in the circuit. The switch is opened in $1 \mathrm{~ms}$. The emf induced across the coil is $20 \mathrm{~V}$. The inductance of the coil is :
- A$5 ~ \mathrm{mH}$
- B$8 ~\mathrm{mH}$
- C$10~ \mathrm{mH}$
- D$12 ~\mathrm{mH}$
✓ Correct answer: C
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