A potentiometer wire of length 4 cm has a some resistance. The resistance connected in series with the wire and accumulator of e.m.f. 2V is `16Omega`. If the potential gradient along wire is `10^(-3)V//cm`. The resistance of potentiometer wire isA. `0.066Omega`B. `0.022Omega`C. `0.033Omega`D. `0.044Omega`

A potentiometer wire of length 4 cm has a some resistance. The resista

1.	A potentiometer wire of length 4 cm has a some resistance. The resistance connected in series with the wire and accumulator of e.m.f. 2V is `16Omega`. If the potential gradient along wire is `10^(-3)V//cm`. The resistance of potentiometer wire isA. `0.066Omega`B. `0.022Omega`C. `0.033Omega`D. `0.044Omega`
Answer» Correct Answer - C `Irho =((E)/(R+R_(h)))(R)/(L)` `:.R+R_(h)=(ExxR)/(L xx I_(rho))=(2xxR)/(10^(-2)xx4xx10^(-1))` `:.R+16=(2R)/(4xx10^(-13))=500R` `:.R=(16)/(499)=0.033 Omega`

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