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Resistivity of the mateial of potentiome...

Resistivity of the mateial of potentiometer wire is `(rho)` and area of its uniform cross section is A, Hence potential gradient on the wire is = ..... .

A

`(I)/(rho A)`

B

`(IA)/(rho)`

C

`IA rho`

D

`(I rho)/(A)`

Text Solution

Verified by Experts

The correct Answer is:
D
`(I rho)/(A)`
Potential gradient
`sigma = (V)/(l) = (IR)/(l) = (I rho l)/(lA) = (I rho)/(A)`
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