Physics (AS & A Level) · May / June 2018 · Paper 11 · Question 37

A motor is required to operate at a distance of 800 m from its power supply. The motor requires a potential difference (p.d.) of 16.0 V and a current of 0.60 A to operate. Two wires are used to supply power to the motor as shown. [diagram: power supply connected by two wires to motor, distance 800 m] The resistance of each of these wires is 0.0050 Ω per metre. What is the minimum output p.d. of the power supply?

1. A11.2 V
2. B16.0 V
3. C18.4 V
4. D20.8 V

As printed in the paper