MHT CET 2022 Physics question

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

Answer: (B)

Solution

For a long solenoid, . With fixed, is directly proportional to the cross-sectional area and inversely proportional to the length . So

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Question ID VK-093926