The resistances of a wire at temperatures $t\,^oC$ and $0\,^oC$ are related by
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${R_t} = R_0^2(1 - \alpha \,t)$
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A${R_t} = {R_0}(1 + \alpha \,t)$
a (a)
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