MHT CET 2024 Physics question

When the number of turns in a coil is doubled without any change in the length of the coil, its self-inductance

(A)becomes 4 timesCorrect
(B)becomes 2 times
(C)gets halved
(D)remains unchanged

Answer: (A)

Solution

For a long coil (solenoid) of length , area and turns, the self-inductance is , so when and are fixed. Doubling the turns, , gives , i.e. option (A). The

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Question ID VK-096756