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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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