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Question: Answered & Verified by Expert
In a meter bridge circuit as shown in the figure, the bridge is balanced when AJ=20 cm. On interchanging P and Q the balance length shifts by

PhysicsCurrent ElectricityNEET
Options:
  • A zero
  • B 80 cm
  • C 40 cm
  • D 60 cm
Solution:
2968 Upvotes Verified Answer
The correct answer is: 60 cm
Initially balancing point is J,

Hence AJBJ=PQ=2080

Now if P & Q are interchanged,

Let balancing point be J1

AJ1BJ1=QP=8020

The balanced point shifts by AJ1-AJ=80-20=60 cm.

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