Electro Magnetic Induction And Alternating Currents Question 536
Question: The average e.m.f. induced in a coil in which the current changes from 2 ampere to 4 ampere in 0.05 second is 8 volt. What is the self-inductance of the coil? [NCERT 1984; CPMT 1997; MP PMT 1999, 2003; UPSEAT 2000; RPMT 2000; Pb. PMT 2002; RPET 2003; DPMT 2005]
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\frac{(4-2)}{0.05}\Rightarrow L=0.2\ H $
