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Question

For the resistance network shown in the figure, choose the correct option(s).




A
The current through PQ is zero
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B
I1=3A
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C
The potential at S is less than that at Q
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D
I2=2A
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Solution

The correct options are
A The current through PQ is zero

B I1=3A
C The potential at S is less than that at Q
D I2=2A
By symmetry, we can conclude that 1 Ω resistances will not receive any current, so circuit reduces to
I1=126×126+12=3 A

I2 is 23 of I1.

I2 = 2 A

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