Physics (AS & A Level) · May / June 2017 · Paper 11 · Question 30

The diagram shows two points P and Q which lie 90° apart on a circle of radius r. A positive point charge at the centre of the circle creates an electric field of magnitude E at both P and Q. Which expression gives the work done in moving a unit positive charge from P to Q?

1. A0
2. BE × r
3. CE × (πr/2)
4. DE × (πr)

As printed in the paper