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ExamsNEETPhysics

In a coil of resistance 10 Ω, the induced current developed by changing magnetic flux through it, is shown in figure as a function of time. The magnitude of change in flux through the coil in Weber is:

  1. 8
  2. 2
  3. 6
  4. 4

Correct answer: 4

Solution

The induced current (I) is related to the rate of change of magnetic flux (dΦ/dt) by Faraday's law: I = (1/R) * |dΦ/dt|. From the graph, the peak current is 0.4 A, and the resistance is 10 Ω, so the peak emf is 0.4 × 10 = 4 V. The total change in flux is the area under the emf vs. time graph, which equals 4 Weber.

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