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Question

The value of current i in the circuit as shown in figure is:
431130.png

A
1.8A
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B
0.8A
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C
0.2A
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D
1.6A
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Solution

The correct option is B 0.8A
Three 5Ω resistors are in series. Their total resistance =15Ω. Now it is in parallel with 5Ω resistor, so total resistance,
1R=15+115=3+115=415
R=154
I=VR=315/4=3×415=0.8A

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