Physics (AS & A Level) · Oct / Nov 2018 · Paper 13 · Question 35

A resistor X of resistance 40 Ω and a variable resistor are connected to a battery of electromotive force (e.m.f.) 12 V and internal resistance 2.0 Ω, as shown. The resistance of the variable resistor is changed from 0 to 40 Ω. What is the change in power dissipated in resistor X?

1. A2.4 W
2. B2.7 W
3. C3.6 W
4. D5.6 W

As printed in the paper