Electro Magnetic Induction And Alternating Currents Question 548
Question: When current in a coil changes to 2 ampere from 8 ampere in $ 3\times {{10}^{-3}},\sec ond $ , the e.m.f. induced in the coil is 2 volt. The self inductance of the coil in millihenry is [MP PET 1995]
Options:
A) 1
B) 5
C) 20
D) 10
Show Answer
Answer:
Correct Answer: A
Solution:
$ e=L\frac{di}{dt} $
Þ $ 2=L\times \frac{6}{3\times {{10}^{-3}}}\Rightarrow L=1\ mH $
