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If the specific resistance of a potentio...

If the specific resistance of a potentiometer wire is `10^(-7)Omega` m and current flowing through it is `0.1` amp, cross-sectional aea of wire is `10^(-6) m^(2)`, then potential gradient will be

A

`10^(-2)v//m`

B

`10^(-4) v//m`

C

`10^(-6) v//m`

D

`10^(-8) v//m`

Text Solution

Verified by Experts

The correct Answer is:
A
Potential gradient `(V)/(l)=(IR)/(l)`
We know that , `R=(rhol)/(A)`
`:.(R)/(l)=(rhoo)/(A)`
`:. (V)/(l)=Ixx (rho)/(A)`
`=(0.1xx10^(-7))/(10^(-6))=10^(-2)V//m`
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