Physics (AS & A Level) · Oct / Nov 2019 · Paper 11 · Question 33

Which graph could show how the resistance R of a filament lamp varies with the applied potential difference (p.d.) V, as V is increased to the normal operating p.d.?

1. AGraph A: R increases linearly with V from a non-zero intercept
2. BGraph B: R increases with V from zero, curve concave down
3. CGraph C: R constant with V
4. DGraph D: R decreases with V from a high value, curve concave up

As printed in the paper