A) 5 H
B) 3 H
C) 4 H
D) 2 H
Correct Answer: A
Solution :
Key Idea: cm/induced in the circuit is directly proportional to the rate of change of current. emf induced oc rate of change of current i.e., \[e\propto \frac{di}{dt}\] when the proportionality constant is removed, the some constant L comes here. Hence, \[e=-L\frac{di}{dt}\] ... (i) Given, e = 0.4V, \[\frac{di}{dt}=\frac{0.2-1}{10}=-\frac{9.8}{10}=-0.08\,A/s\] \[\therefore \] \[L=\frac{0.4}{0.08}=5\,H\] Note: The minus sign in Eq. (i) is a reflection of Lenzs law.
You need to login to perform this action.
You will be redirected in
3 sec
