In the circuit shown below, $P$ is a potentiometer with a total resistance of $10\,\Omega$ and $Q$ is a fixed resistor with a resistance of $10\,\Omega$. The battery has an electromotive force (e.m.f.) of $4.0\,\text{V}$ and negligible internal resistance. The voltmeter has a very high resistance. The slider on the potentiometer is then shifted from $X$ to $Y$, and a graph of voltmeter reading $V$ is drawn against slider position. Which graph would be obtained?
Physics 9702 · AS & A Level · Potential dividers