For what value of unknown resistance X, the potential difference between B and D will be zero in the arrangement of fig.

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4 Ω

2 Ω

3 Ω

6 Ω

answer is D.

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Detailed Solution

When the bridge is balanced, the potential difference between B and D will be zero.PQ=RS120⋅5=6+X0⋅5 or 12=6+XX=6Ω

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