Q$2.$ Referring to Table $1.$ Determine the resistance of a $5-$km$-$long solid copper annealed conductor with a diameter of $1\mathrm{.}2$ cm $,$ at temperature $20C$ and $80C.$ Calculate the value of the radius of the conductor if the value of the resistance is $12$ at a temperature of $70C.$

Merujuk kepada Jadual $1.$ Tentukan rintangan konduktor kuprum sepuh selinder padu panjang $5$ km dengan $1\mathrm{.}2$ cm diameter pada suhu $20C$ dan $80C.$ Kirakan nilai jejari conductor jika nilai rintangan ialah $12$ pada suhu $70C.$

TABLE $1$ Resistivities and Temperature Coefficients of Resistance

$\backslash$table$[[$Material$,\backslash$table$[[$Resistivity $$ at $20C$