Electro Magnetic Induction And Alternating Currents Question 595

Question: The current in a coil decreases from 1 A to 0.2 A. In 10sec. Calculate the coefficient of self inductance. If induced emf is 0.4 volt. [BCECE 2004]

Options:

A) 5 H

B) 3 H

C) 4 H

D) 2 H

Show Answer

Answer:

Correct Answer: A

Solution:

$ e=-L\frac{di}{dt}\Rightarrow 0.4=-\frac{L(0.2-1)}{10} $
$ \Rightarrow L=5\ H $



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