$A$ long solenoid of $N$ turns has a self-inductance $L$ and area of cross-section $A$. When a current $i$ flows through the solenoid,the magnetic field inside it has magnitude $B$. The current $i$ is equal to:
- A$BAN/L$
- B$BANL$
- C$BN/AL$
- D$B/ANL$
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