When a current of $1 \,A$ is passed through a coil of $100$ turns, the flux associated with it is $2.5 \times 10^{-5} \,Wb/\text{turn}$. The self-inductance of the coil in millihenry is:
- A$40$
- B$25$
- C$4$
- D$2.5$
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MediumAIIMS 2011
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