Question

Nichrome and copper wires of same length and same radius are connected in series. Current I is passed through them. Which wire gets heated up more ? Justify your answer

Answer 1

We know that, $R=\rho \frac{l}{A}\frac{R_{Cu}}{R_{Ni}}=\frac{{\rho }_{Cu}}{\rho Ni}\because {\rho }_{Cu}<{\rho }_{Ni}\because R_{Cu}<R_{Ni}\because H=I^{2}RtH\propto R$
$\therefore$ Nichrome wire will have more heat.