A-LevelPhysicsElectric fields9702/12 · May/June 2010 · Q281 Mark
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. [Figure 28.1] Which expression gives the work done in moving a unit positive charge from P to Q?
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A0
BE × r
CE × (πr / 2)
DE × (πr)
✓ Correct answer
A: 0
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