A cell has an electromotive force (e.m.f.) of $6\,\text{V}$ and internal resistance $R$. An external resistor, also with resistance $R$, is connected across the cell, as illustrated. Power $P$ is dissipated in the external resistor. The cell is then swapped for another cell with an e.m.f. of $6\,\text{V}$ and negligible internal resistance. What is the new power dissipated in the external resistor?
- A$0.5P$
- B$P$
- C$2P$
- D$4P$