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What resistor should be connected in parallel with the `20Omega` resistor in branch ADC in the circuit shown in fig. so that potential difference betw

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What resistor should be connected in parallel with the `20Omega` resistor in branch ADC in the circuit shown in fig. so that potential difference between B and D may be zero ?
image
A. `20 Omega`
B. `10 Omega`
C. `5 Omega`
D. `5 Omega`
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1 Answer

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Correct Answer - A
By symmetry, we see that the current in the left and right arms
should be the same. It means no current should flow from A to B.
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