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A potentiometer wire PQ of length 1 m is connected to a standard cell E1. Another cell E2 of emf 1.02V 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 49cm from Q. The potential gradient in the potentiometer wire is:

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a
0.02V/cm
b
0.04V/cm
c
0.01V/cm
d
0.03V/cm

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detailed solution

Correct option is A

Balancing length is measured from P.
So 10049=51cm
E2=ϕ×51
Where ϕ= Potential gradient
1.02=ϕ×51ϕ=0.02V/cm

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