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  4. The self inductance L of a solenoid of length l and area of cross-section A, with a fixed number of turns N increases as

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Q. The self inductance $L$ of a solenoid of length $l$ and area of cross-section $A$, with a fixed number of turns $N$ increases as

Electromagnetic Induction

Solution:

The self inductance $L$ of a solenoid of length $l$ and area of cross section $A$ with fixed number of turns $N$ is
$ L = \frac{\mu_o N^2 A}{l}$
So, $L$ increases when $l$ decreases and $A$ increases.