A constant voltage is applied between the two ends of a uniform metallic wire. Some heat is develope

Question

A constant voltage is applied between the two ends of a uniform metallic wire. Some heat is developed in it. The heat developed is doubled if\

Professor PC Thomas Classes · Answer

$\mathrm{H}=\frac{\mathrm{V}^{2}}{\mathrm{R}}$ H will be doubled if R is halved\ $\mathrm{R}=\frac{ho \mathrm{L}}{\pi \mathrm{r}^{2}}$\ $R$ is halved if $L$ and $r$ are doubled.\