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In the figure shown PQ is a potentiomete...

In the figure shown `PQ` is a potentiometer wire. When galvanometer is connected at A, it shows zero deflection when `PJ = x`. Now the galvanometer is connected to B and it shows zero deflection when `PJ = 3x`. find the value of unknown resistance `R_(X)` in term of `R`.

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The correct Answer is:
`R_(X) = 2R`
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