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Q.

A potentiometer wire PQ of 1 m length is connected to a standard cell E1. Another cell E2 of emf 1.02 V is connected with a resistance ‘r’ and switch S (as shown in figure). With switch S open, the null position is obtained at a distance of 49 cm from Q. The potential gradient in the potentiometer wire is:

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a

0.02 V/cm

b

0.01 V/cm

c

0.04 V/cm

d

0.03 V/cm

answer is A.

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Detailed Solution

As switch S is open→ Under balancing condition, no current flows through secondary circuit.So VPJ=E2(Pot. gradient) =E2lPJ(Pot. gradient) =1.020.51Vcm=0.02Vcm

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A potentiometer wire PQ of 1 m length is connected to a standard cell E1. Another cell E2 of emf 1.02 V is connected with a resistance ‘r’ and switch S (as shown in figure). With switch S open, the null position is obtained at a distance of 49 cm from Q. The potential gradient in the potentiometer wire is: