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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 text end text c m from P. Then what is the unknown resistance X?

  1. fraction numerator R over denominator 2 end fraction    
  2. fraction numerator R over denominator 3 end fraction    
  3. 2R    
  4. 3R    

The correct answer is: 2R

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