Physics

Problem

A platinum wire has a resistance of

5.00\,\Omega

20\,^{\circ}\text{C}

and

6.20\,\Omega

80\,^{\circ}\text{C}

. Assuming the temperature coefficient of resistivity remains constant, calculate its value

\alpha

20\,^{\circ}\text{C}

. a)

3.2\times10^{-3}\,^{\circ}\text{C}^{-1}

6.0\times10^{-3}\,^{\circ}\text{C}^{-1}

4.0\times10^{-3}\,^{\circ}\text{C}^{-1}

3.0\times10^{-3}\,^{\circ}\text{C}^{-1}