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Find the induced EMF in an inductor of 2mH and the current rate is 2000 units.

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in Electromagnetic Theory by (188k points)
Find the induced EMF in an inductor of 2mH and the current rate is 2000 units.

(a) 4

(b) -4

(c) 1

(d) -1

This question was posed to me in an international level competition.

I would like to ask this question from Magnostatic Energy in division Magnetostics of Electromagnetic Theory

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The correct option is (b) -4

The best I can explain: The induced emf is given by e = -Ldi/dt. Put L = 2 x 10^-3 and di/dt = 2000 in the equation. We get e = -2 x 10^-3 x 2000 = -4 units.

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