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Question

In a meter bridge, the balancing length from left is found to be 20 cm when standard resistance of 1 Ω is in right gap. The value of unknown resistance is
  1. 0.25 Ω
  2. 0.4 Ω
  3. 0.5 Ω
  4. 4 Ω


Solution

The correct option is A 0.25 Ω
For calculation of unknow resistance, 
x20=180x=14=0.25 Ω

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