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Question

A potentiometer wire of length 10 m and a resistance 30Ω is connected in series with a battery of emf 2.5 V and internal resistance 5Ω and an external resistance R. If the fall of potential along the potentiometer wire is 50 μV/mm, the value of R is (in Ω)

A
115
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B
80
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C
50
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D
100
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Solution

The correct option is A 115
By using x=e(R+Rh+r).RL
50×106103=2.5(30+R+5)×3010R=115

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