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