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MHT CET 2025 Physics question

PhysicsElectromagnetic InductionMHT CET 2025

To manufacture a solenoid of length '' and inductance 'L', the length of the thin wire required is (Diameter of the solenoid is very less than length, = permeability of free space)

Answer: (A)

Solution

Let the solenoid have turns and radius ; the wire length is , so . The inductance of a long solenoid is . Substituting : .

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Question ID VK-101867