Q. In figure, final value of current in 10Ω resistor, when plug of key K is inserted is

(a) 3/10 A

(b) 3/20 A

(c) 3/11 A

(d) zero

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Ans: (d)

Sol: $\displaystyle V = L\frac{di}{dt}$

In steady state , $ \displaystyle \frac{di}{dt} = 0 $

Hence , V = 0

$ \displaystyle i = \frac{V}{R} = 0 $