Electromagnetic Induction - Result Question 35
35. If the number of turns per unit length of a coil of solenoid is doubled, the self-inductance of the solenoid will
(a) remain unchanged
(b) be halved
(c) be doubled
(d) become four times
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Answer:
Correct Answer: 35. (d)
Solution:
- (d) Self inductance of a solenoid $=\frac{\mu n^{2} A}{\ell}$
So, self induction $\propto n^{2}$
So, inductance becomes 4 times when $n$ is doubled.
