Charging materials by friction
2 marks · EasyA material becomes positively charged when rubbed. Explain in terms of electrons how this happens.
Does the material gain or lose electrons?
Explain why losing electrons makes the material positively charged.
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(a) It loses electrons.
(b) After losing electrons, it has more protons than electrons, so is positively charged.
Common mistakes: Saying protons are gained or lost
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Marking points
B1 (a) · 1 mark · States that losing electrons causes positive charging.
B1 (b) · 1 mark · Explains that more protons than electrons results in a positive charge.
Worked solution
(a) The material loses electrons.
(b) This means there are now more protons than electrons, so the object is positively charged.