Physics (AS & A Level) · Oct / Nov 2023 · Paper 12 · Question 31

In the circuit shown, a fixed resistor X is connected in series with a battery and a variable resistor. The power dissipated in resistor X is 7.2 W when a current of 3.0 A passes through it. The variable resistor is adjusted so that the power dissipated in X increases by 50%. What is the new current in the circuit?

1. A2.4 A
2. B3.7 A
3. C4.5 A
4. D14 A

As printed in the paper