If resistance S in RB=300Omega, then the...

If resistance `S` in `RB=300Omega`, then the balanced length is found to be `25.0 cm` from end `A`. The diameter of unknown wire is `1mm` and length of the unknown wire is `3.14cm`. The specific resistivity of the wire should be

`2.5xx10^(-4)Omega-m`

`3.5xx10^(-4)Omega-m`

`4.5xx10^(-4)Omega-m`

`1.5xx10^(-4)Omega-m`

Text Solution

Verified by Experts

The correct Answer is:

`(R)/(300)=(25)/(75)impliesR=100`,
`p=(Rpid^(2))/(4L)=2.5xx10^(-4)Omega-m`

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