1.

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.            \[{{R}_{t}}=R_{0}^{2}(1-\alpha \,t)\]                             
Answer» B.                                      \[{{R}_{t}}={{R}_{0}}(1-\alpha \,t)\]


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