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Passage : The thermal coefficient of r...

Passage :
The thermal coefficient of resistivity is given by `alpha=(1)/(rho)(d rho)/(dT)` where `rho` is resistivity at a temperature T. `alpha` is not constant, rather varies as `alpha=(-n)/(T)`, where T is temperature in Kelvin and n is a constant. For carbon `alpha=-0.0005K^(-1)and rho=3.5xx10^(-5)(Omega-m)"at"27^(@)C`
Find the value of .n. for carbon

A

`rho prop T^(n)`

B

`rho prop T^(n-1)`

C

`rho prop T^(-n)`

D

`rho prop (n)/(T)`

Text Solution

Verified by Experts

The correct Answer is:
C
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