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Question 20249
JEE Physics · Medium

Electromagnetic Induction and Alternating Current: Electromagnetic Induction — Self Inductance MCQ

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Electromagnetic Induction — Self InductanceMediumQuestion 20249

Question

Self-inductance of a coil is 2 H. Current changes from 2 A to 6 A in 0.1 s. Induced back EMF is:
  1. A
    80 V
    Correct
  2. B
    8 V
  3. C
    40 V
  4. D
    4 V

Correct answer

80 V

Explanation

|EMF| = L|dI/dt| = 2 × (6−2)/0.1 = 2 × 40 = 80 V.

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