When a current of $2 \ A$ is passed through a coil of $100$ turns,the magnetic flux associated with it is $5 \times 10^{-5} \ Wb$. Find the self-inductance of the coil.
- A$4 \times 10^{-3} \ H$
- B$4 \times 10^{-2} \ H$
- C$2.5 \times 10^{-3} \ H$
- D$10^{-3} \ H$
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