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A potentiometer wire has a length of 4m and a resistance of 5Ω.

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A potentiometer wire has a length of 4 m and a resistance of 5Ω. What resistance should be connected in series with a potentiometer wire and a cell of e.m.f. 2V having internal resistance 1Ω to get a potential gradient of 10–3 V/cm?

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Given: L = 4 m, R1 = 5Ω, E = 2 V, r = 1Ω,

K = 10-3 V/cm = 10-1 V/m

To find: Series resistance (X)

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