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MHT CET Physics question

PhysicsElectromagnetic InductionMHT CET

A coil is wound on a core of rectangular cross-section. If all the linear dimensions of core are increased by a factor 2 and number of turns per unit length of coil remains same, the self-inductance increases by a factor of

Answer: (B)

Solution

For a long coil with n (turns per unit length) fixed; doubling every linear dimension makes the area A four times and the length l twice, so L

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Question ID VK-082182