O-LevelPhysicsElectricity5054/22 · May/June 2016 · Q76 Marks
An uncharged piece of metal P rests on an insulator. A positively charged rod is placed close to P, as shown in Fig. 7.1.
- (a)State a material that is an electrical insulator.[1]
- (b)On Fig. 7.1, draw the distribution of charges on P.[2]
- (c)(i)On Fig. 7.2, show the distribution of charges on P with the earth wire connected.[1]
- (c)(ii)1.State what happens to the charges on P if the positively charged rod is removed 1. with the earth wire still connected to P,[1]
- (c)(ii)2.2. after the earth wire is disconnected from P.[1]
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.
Mark scheme
Marking points from the official mark scheme (May/June 2016). The mark or mark type is shown in brackets.
- [1] any insulator, e.g. perspex, plastic, nylon, rubber
- [1] top of P shows a net negative charge with some negative charges under rod
- [1] bottom of P has equal number of positive charges
- [1] clear net negative charge on P and (net) negative charges above or at middle line
- [1] negative (charges)/electrons flow to earth or (P) becomes neutral
- [1] charges spread over P
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