A typical mobile phone battery has an e.m.f. of $5.0\,\text{V}$ and an internal resistance of $200\,\text{m}\Omega$. What is the terminal p.d. of the battery when it delivers a current of $500\,\text{mA}$?
- A$4.8\,\text{V}$
- B$4.9\,\text{V}$
- C$5.0\,\text{V}$
- D$5.1\,\text{V}$