The diagram shows two voltmeters $P$ and $Q$ connected to a potential divider. The sliding contact at point $X$ is shifted towards the top of the diagram. What happens to the reading on $P$ and to the reading on $Q$?
- Areading on $P$ decreases, reading on $Q$ decreases
- Breading on $P$ decreases, reading on $Q$ increases
- Creading on $P$ increases, reading on $Q$ decreases
- Dreading on $P$ increases, reading on $Q$ increases