When the current changes from +2 A to -2 A in 0.05 second, an e.m.f. of 8 V is induced in a coil. The coefficient of self-induction of the coil is: - Physics MCQ AIEEE 2003 2026 | ExamTest.live

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When the current changes from + 2 A to - 2 A in 0.05 second, an e.m.f. of 8 V is induced in a coil. The coefficient of self-induction of the coil is:

Solution & Step-by-step Explanation

Induced emf e = - L \frac{d i}{d t} .Magnitude: ∣ e ∣ = L \frac{∣Δ i ∣}{Δ t} . Δ i = (- 2) - (+ 2) = - 4 A . 8 = L \frac{4}{0.05} 8 = L \times 80 ⟹ L = 0.1 H .

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When the current changes from + 2 A to - 2 A in 0.05 second, an e.m.f. of 8 V is induced in a coil. The coefficient of self-induction of the coil is:

0.2 H

0.4 H

0.8 H

0.1 H

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