. 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 second case it is connect at point C and zero deflection is observed at a length 30 cm from P. Then the unknown resistance X is


A. 2R

B. R/2

C. R/3

D. 3R

Best Answer

Ans :A

Sol: In potentiometer wire potential difference is directly proportional to length.

Let potential drop unit length a potentiometer wire be K.

For zero deflection the current will flow independently in two circles



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