Physics (AS & A Level) · Feb / March 2022 · Paper 12 · Question 34

A cell of electromotive force (e.m.f.) E and internal resistance r is connected to a variable resistor, as shown. The resistance of the variable resistor is gradually increased from r to 3r. Which graph shows the variation of the potential difference (p.d.) v across the internal resistance with the p.d. V across the variable resistor?

1. Agraph A
2. Bgraph B
3. Cgraph C
4. Dgraph D

As printed in the paper