Physics
General
Easy

Question

Circuit for the measurement of resistance by potentiometer is shown. The galvanometer is first connected at point-A and zero-deflection is observed at length  PJ=10 cm. In the second case, it is connected at a point C and zero deflection is observed at a length 30 cm from . Then what is the unknown resistance X?

  1. R over 2
  2. R over 3  
  3. 2R
  4. 3R

The correct answer is: 2R

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