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Q.

A potentiometer wire has length 4m and resistance 8Ω . The resistance that must be connected in series with the wire and an accumulator of e.m.f 2V, so as to get a potential gradient 1mV per cm on the wire is 

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a

44Ω

b

40Ω

c

48Ω

d

32Ω

answer is D.

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Detailed Solution

x=EBRp(RP+Rs+r)L

0.1=2×8(8+R+0)4

R=32 Ω

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A potentiometer wire has length 4m and resistance 8Ω . The resistance that must be connected in series with the wire and an accumulator of e.m.f 2V, so as to get a potential gradient 1mV per cm on the wire is