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 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 shifted from X to Y, and a graph of voltmeter reading $V$ is drawn against slider position. Which graph is obtained?
Physics 9702 · AS & A Level · Potential dividers