A plantinum wire has resistance of `10 Omega` at `0^(@)C` and `20 Omega` at `273^(@)C`. Find the value of coefficient of resistance.
A plantinum wire has resistance of `10 Omega` at `0^(@)C` and `20 Omega` at `273^(@)C`. Find the value of coefficient of resistance.
A. 273 per degree C
B. 273 per degree K
C. `(1)/(273)` per degree C
D. `(1)/(273)` per degree K
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Correct Answer - C
`R_(t)=R_(0)(1+alpha t)`
`:.alpha=(R_(1)-R_(0))/(R_(0)t)=(20-10)/(10xx273)`
`=(1)/(273)` per degree C
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