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

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4.5 A

6.0 A

3.0 A

Zero

answer is A.

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Detailed Solution

Let V be the potential of the junction as shown in figure. Applying junction law, we haveor 40 – 2V + 5 – V = 2V or 5V = 45 V = 9V

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