Physics (AS & A Level) · May / June 2023 · Paper 13 · Question 33

A cell of negligible internal resistance is connected in series with a thermistor, a fixed resistor and an ammeter. The thermistor is placed in a beaker of water and the temperature of the water is slowly increased. A graph of current I against the temperature T of the thermistor is plotted. Which graph could show the variation of I with T?

1. AGraph A: I against T, curve starting at a constant value then decreasing
2. BGraph B: I against T, curve increasing from a low value
3. CGraph C: I against T, straight line decreasing
4. DGraph D: I against T, curve decreasing steeply from a high value

As printed in the paper