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Q.

Four Resistances P,Q,R,X formed a wheat stone bridge. The bridge is balanced when R=100Ω. If P and Q are interchanged the bridge balanced for 121Ω. The value of X is

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a

200Ω

b

300Ω

c

100Ω

d

110Ω

answer is D.

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Detailed Solution

The balancing condition for a Wheatstone bridge is 

PQ=RX

therefore

PQ=100X

And

QP=121X

⇒100×121X2=1

⇒X=110Ω

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