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Resistance of a resistor at temperature ...

Resistance of a resistor at temperature `t^@C` is `R_t =R_0 (1+alphat + betat^2)`, where `R_0` is the resistance at `0^@C`. The temperature coefficient of resistance at temperature `t^@C` is

A

`(a+2bt)/(1+at+bt^(2))`

B

`(a+2bt)`

C

`(1+at+bt^(2))/(a+2bt)`

D

constant

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The correct Answer is:
A
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