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Q.

In meterbridge experiment when a resistance wire is connected in the left gap, the balance point is found at 30 cm. When the wire is replaced by another wire, the balance point is found at 60 cm. Find the balance point when the two wires connected in series.

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a

65.9 cm

b

25 cm

c

55.9 cm

d

20 cm

answer is A.

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Detailed Solution

R1R=3070=37&R2R=6040=32;R1+R2R=37+32=6+2114=2714⇒2714=n(100−n) 2700=(27+14)n⇒n=270027+14≈65.9cm
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