Physics · Oct / Nov 2025 · Paper 12 · Question 34

A resistor of resistance R is connected to a variable resistor, a voltmeter and a power supply of electromotive force (e.m.f.) E. The resistance of the variable resistor increases from 0 to 2R. What happens to the reading on the voltmeter?

1. AIt increases from 0 to $\frac{1}{3}E$.
2. BIt increases from 0 to $\frac{1}{2}E$.
3. CIt increases from 0 to $\frac{2}{3}E$.
4. DIt increases from 0 to $E$.

As printed in the paper