Question

Find voltage across 10H inductor.

(a) 2V

(b) 10V

(c) 12V

(d) 20V

This question was posed to me by my school principal while I was bunking the class.

Origin of the question is Coils Connected in Series in portion Inductance in a DC Circuit of Basic Electrical Engineering

Answer 1

The correct choice is (b) 10V

The explanation is: e=Ldi/dt

Leq=2+10+12+20=44H

di/dt=44/44 = 1 A/s.

Voltage across 10H inductor = 10*di/dt = 10*1=10V.