question_answer

The resistances of a wire at temperatures \[t{}^\circ C\] and \[0{}^\circ C\] are related by                                            [MP PMT 1993]

A)                    \[{{R}_{t}}={{R}_{0}}(1+\alpha \,t)\]

B)                                      \[{{R}_{t}}={{R}_{0}}(1-\alpha \,t)\]

C)                    \[{{R}_{t}}=R_{0}^{2}(1+\alpha \,t)\]                    

D)            \[{{R}_{t}}=R_{0}^{2}(1-\alpha \,t)\]