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MHT CET Physics question

PhysicsAlternating CurrentMHT CET

When a coil connected to a D.C. source of e.m.f. 12 volt, then a current of 4 ampere flows in it. If the same coil is connected to a 12 volt, 50 cycles/s A.C source, then the current flowing in it is 2.4 A. The self inductance of the coil will be

Answer: (D)

Solution

DC gives ; with AC, so and X_L$/(2π f) = 4/(100π) ≈

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Question ID VK-081979