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MHT CET 2025 Physics question

PhysicsElectromagnetic InductionMHT CET 2025

The magnetic flux through a coil is Wb at time . It reduces to 30% of its original value in time second. If e.m.f. induced in the coil is 0.56 mV then the value of is

Answer: (A)

Solution

Final flux Wb, so the change in flux is Wb. By Faraday's law, , so

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Question ID VK-100513