Question
A wire of resistance $R$ is connected across a cell of emf $\varepsilon$ and internal resistance $r$. The current through the circuit is $I$. For a time $t$, the work done by the battery to establish the current $I$ is
A wire of resistance $R$ is connected across a cell of emf $\varepsilon$ and internal resistance $r$. The current through the circuit is $I$. For a time $t$, the work done by the battery to establish the current $I$ is