Physics (AS & A Level) · May / June 2017 · Paper 13 · Question 34

A graph of potential difference (p.d.) V across a cell against current I in the cell is shown. [graph of V against I, a straight line with negative gradient from a positive V intercept to a positive I intercept] As the cell reaches the end of its useful life, its internal resistance increases and its electromotive force (e.m.f.) decreases. Which diagram shows a graph of V against I for the cell nearing the end of its useful life?

1. Agraph with lower V intercept and steeper gradient than original
2. Bgraph with lower V intercept and same gradient as original
3. Cgraph with same V intercept and steeper gradient than original
4. Dgraph with lower V intercept and shallower gradient than original

As printed in the paper