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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

A

`2.5 xx 10^(-4)Omega-m`

B

`3.5 xx 10^(-4)Omega-m`

C

`4.5 xx 10^(-4)Omega-m`

D

None of these

Text Solution

Verified by Experts

`(R)/(300) = (25)/(75) rArr R = 100 rArr rho = (Rpid^(2))/(4L) = 2.5 xx 10^(-4) Omega-m` .
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