Electro Magnetic Induction And Alternating Currents Question 559

Question: The average e.m.f. induced in a coil in which a current changes from 0 to 2 A in 0.05 s is 8 V. The self inductance of the coil is [CPMT 1999]

Options:

A) 0.1 H

B) 0.2 H

C) 0.4 H

D) 0.8 H

Show Answer

Answer:

Correct Answer: B

Solution:

$ e=-L( \frac{di}{dt} )\Rightarrow 8=-L\times ( -\frac{2}{0.05} ) $
$ \Rightarrow \ L=0.2H $



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