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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.

A

`4.5 A`

B

`6.0 A`

C

`3.0 A`

D

Zero

Text Solution

Verified by Experts

The correct Answer is:
A
(a) Let `V` be the potential of the junciton as shown in figure. Applying junction law, we have
or `(20 - V)/(2) + (5 - V)/(4) = (V - 0)/(2)`
or `40 - 2 V + 5 - V = 2V` or `5 V = 45 implies V = 9 V`
`:. i_(3) = (V)/(2) = 4.5 A`
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