Q.

Four Resistances P,Q,R,X formed a wheat stone bridge. The bridge is balanced when R=100  Ω. If P and Q are inter changed the bridge balance 121  Ωfor. The value of x is

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a

200  Ω

b

100  Ω

c

300  Ω

d

110  Ω

answer is D.

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Detailed Solution

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Case 1: PQ=RXPQ=100X1

Case 2: QP=121X2

X121=100X

X2=100×121X=110Ω

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