MHT CET 2025 Physics question

A coil of wire of radius 'r' has 600 turns and a self-inductance of 108 mH. The self-inductance of a coil with same radius and 500 turns is

(A)80 mH
(B)75 mHCorrect
(C)108 mH
(D)90 mH

Answer: (B)

Solution

The self-inductance of a coil of given geometry is , because the flux linked is proportional to N and the field produced by the current is also proportional to N. Therefore

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Question ID VK-102624