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  4. When the switch S, in the circuit shown, is closed, then the value of current i will be :

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Q. When the switch $S$, in the circuit shown, is closed, then the value of current $i$ will be :Physics Question Image

JEE MainJEE Main 2019Current Electricity

Solution:

Let voltage at $C = xv$
KCL : $i_1 + i_2 = i$
$\frac{20-x}{2} + \frac{10-x}{4} = \frac{x-0}{2}$
$ \Rightarrow x = 10 $
and $i = 5\, amp$.

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