Q. 4 B4.1( 29 Votes )
In the diagram sh
Answer :
When switch is open, the upper two resistances are connected in parallel in the circuit.
Effective resistance is 1/Req=1/R+1/R=2/R
Req = R/2
So the current=I=V/(R/2)=0.6A (given)
V/R = 0.3 A
When the switch closes, the third resistance also comes in the circuit.
The effective resistance of the circuit becomes R/3
Hence, Current I = V/(R/3) = 3 (V/R) = 3 x 0.3 = 0.9 A
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