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  4. If the number of turns per unit length of a coil of solenoid is doubled, the self-inductance of the solenoid will

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Q. If the number of turns per unit length of a coil of solenoid is doubled, the self-inductance of the solenoid will

Electromagnetic Induction

Solution:

Self inductance of a solenoid $=\mu_{0}n^{2}Al$
where $n$ is the number of turns per length
$\therefore $ Self inductance is directly proportional to $n^{2}$ Self inductance becomes $4$ times when $n$ is doubled