Two different conductors have same resistance at `0^@` C It is found that the resistance of the first conductor at `t_1^@` C is equal to the resistance of the second conductor at `t_2^@` C. The ratio of temperature coefficients of resistance of the conductors,`a_1/a_2` is

Options

A. `t_(1)/t_(2)`
B. `(t_(2)-t_(1))/t_(2)`
C. `(t_(2)-t_(1))/t_(1)`
D. `t_(2)/t_(1)`

Answer

D

Explanation

`R_(0) (1 + alpha_(1)t_(1)) = R_(0) (1 + alpha_(2)t_(2))`
`rArr alpha_(1)/alpha_(2) = t_(2)/t_(1)`