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MHT CET Medical202622 April 2026Morning ShiftPhysicsElectromagnetic InductionActual

Average e.m.f. of 2.4 V is induced in a coil when a current in it is changed from 10 A in one direction to 10 A in opposite direction in 0.4 second. The self inductance of the coil is

Options

  1. A50 mH
  2. B48 mH
  3. C45 mH
  4. D42 mH

Correct answer

B. 48 mH

Step-by-step solution

Given e = 2.4 V , I₁ = 10 A , I₂ = -10 A , and t = 0.4 s . The magnitude of the average induced e.m.f. is given by: |e| = L | I| t Substituting the given values: 2.4 = L |-10 - 10| 0.4 2.4 = L 20 0.4 2.4 = 50 L L = 2.4 50 = 0.048 H L = 48 mH Answer: 48 mH

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