CUET · PHYSICS · PYQ PAPER 2025
The self-inductance (L) of a long solenoid on doubling its number of turns and length, keeping other factors constant, will become
- A L/2
- B L
- C 2L
- D 4L
Answer & Solution
Correct Answer
(C) 2L
Step-by-step Solution
Detailed explanation
\(L = \frac{\mu_0 N^2 A}{l}\) \(L' = \frac{\mu_0 (2N)^2 A}{2l}\) \(L' = \frac{\mu_0 4N^2 A}{2l}\) \(L' = 2 \frac{\mu_0 N^2 A}{l}\) \(L' = 2L\)
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