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The resitivity of a potentio meter wire ...

The resitivity of a potentio meter wire is, if the area of cross section of the wire is `4cm^(2)`, the current flowing in the circuit is 1A, the poetntial gradient is `7.5(v)/(m)`

A

`3xx10^(-3)Omega-m`

B

`2xx10^(-6)Omega-m`

C

`4xx10^(-6)Omega-m`

D

`5xx10^(-4)Omega-m`

Text Solution

Verified by Experts

The correct Answer is:
A
`P.G=(iR)/(l)`, resistivity `rho=(RA)/(L)`
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