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The resistance of platinum wire at $0^{\circ}\,C$ is $2\,\Omega$ and $6.8\,\Omega$ at $80^{\circ} \,C$. The temperature coefficient of resistance of the wire is :
  • A$3 \times 10^{-1}{ }\;^{\circ}\,C ^{-1}$
  • B$3 \times 10^{-4}{ }\;^{\circ}C ^{-1}$
  • C$3 \times 10^{-3}{ }\;^{\circ}C ^{-1}$
  • D$3 \times 10^{-2}{ }\;^{\circ}C ^{-1}$
NEET 2023, Medium
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