O-LevelPhysicsElectricity5054/11 · Oct/Nov 2010 · Q271 Mark

A negatively-charged sphere X is brought up to an identical uncharged sphere Y. The spheres do not touch. Sphere Y is 'earthed' by touching it with a finger, which is then removed. Sphere X is then moved away from sphere Y. What is the final charge, if any, on sphere Y?

This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.

Asphere showing uniformly distributed negative charges.

Bsphere showing uniformly distributed positive charges.

Csphere showing no charge.

Dsphere showing uniformly distributed positive charges.

✓ Correct answer

B: sphere showing uniformly distributed positive charges.

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Topic: Electricity, O-Level Physics (syllabus 5054). Multiple choice, 1 mark.
Source: O-Level Physics, Oct/Nov 2010 Paper 1 Variant 1, question 27.

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