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Define self-inductance and give its SI u...

Define self-inductance and give its SI unit. Derive an expression for self-inductance of a long, air cored solenoid of length l, radius r and having N number of turns.

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Self inductance of a coil is numerically equal to the flux linked with the coil when the current through the coil is 1 A.
S.I. unit of Self inductance is henry
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