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As the switch S is closed in the circuit...

As the switch S is closed in the circuit shown in figure, current passed through it is

Text Solution

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Let be the potential of the junction.
Let the currents flowing towards A, B and the ground from the junction be `i_1,i_2 and i_3`respectively.
By KCL at the junction `i_1+i_2+i_3=0 implies (V-20)/2+(V-5)/4+(V-0)/2=0 implies V=9Vol t`
So, the current through the switch, `i=9/2=4.5A`
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