The diagram illustrates a circuit containing a battery connected to a resistor $R$. The battery has an internal resistance, shown by resistor $r$. A second resistor, which is the same as $R$, is then connected in parallel with $R$. Which row states how the potential difference (p.d.) across $r$ and the current on the ammeter change when the second resistor is added?
Physics 9702 · AS & A Level · Momentum and Newton's laws of motion