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Find the induced EMF in an inductor of 2mH and the current rate is 2000 units.(a) 4(b) -4(c) 1(d) -1This 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

Answer»

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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