The diagram illustrates a battery linked to a potential divider and to two lamps, $P$ and $Q$. The slider on the potential divider is shifted from end $X$ to end $Y$ of the resistor. Which row indicates how the brightness of each lamp changes?
- Abrightness of $P$: brighter; brightness of $Q$: brighter
- Bbrightness of $P$: brighter; brightness of $Q$: dimmer
- Cbrightness of $P$: unchanged; brightness of $Q$: brighter
- Dbrightness of $P$: unchanged; brightness of $Q$: dimmer