Inductors - Technical MCQs

In the given circuit, what will the voltage be across R₃ 25 s after the switch is moved to position 2?

A 2.88 V

B 5.9 V

C 8.34 V

D 14 V

ANS:B - 5.9 V

I(0-)=14/940=0.0148A....Inductor gets shorted.

At position 2.
inductor starts discharging
I(t)=I(0-)*e^(-t/T)---------> (a)
T=L/R=.1/1380=7.2*10^-5.

t/T=25*10^-6/7.2*10^-5=0.3472.
put this value in (a).
I(25us)=0.01052.
The voltage of R3=560*0.01052=5.9V.

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