O-LevelPhysicsElectricity5054/11 · May/June 2010 · Q251 Mark

Two metal spheres P and Q are mounted on insulating stands and are touching each other. They are uncharged. A positively-charged metal sphere on an insulating handle is brought close to P but does not touch it. This induces charges on P and Q. The positively-charged metal sphere is held in this position and sphere Q is moved to the right, away from sphere P. What are the signs of the induced charges on P and Q and how do the sizes of these charges compare?

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Anegative positive equal

Bnegative positive unequal

Cpositive negative equal

Dpositive negative unequal

✓ Correct answer

A: negative positive equal

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Topic: Electricity, O-Level Physics (syllabus 5054). Multiple choice, 1 mark.
Source: O-Level Physics, May/June 2010 Paper 1 Variant 1, question 25.

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