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Inductors - Technical MCQs

Q1:

What is the current rise after 2 time constants if Vs = 12 V dc, R = 60 omega.gif, and the inductor is rated at 24 mH?

A 79.9 mA

B 126.4 mA

C 173.0 mA

D 198.6 mA

ANS:C - 173.0 mA

I = It*(e^(-2))

It=Vs/Z

Z=(R^2+Xl^2)^1/2
Xl=2*3.14*f*L /// f=0,Since DC ///

Z = R

It = Vs/R
=12/60
=.2

Now,
I = .2(e^(-2))
= .1729
=173mA