terminology accurately spelling, punctuation and grammar are used with few errors Q4. Answer Acceptable Mark answers (a) an explanation balloons repulse / linking: balloons push away repel (1) (because) (from each other/to they have like the side) same charges (1) charge / both positive / both negative accept like charges repel for 2 marks (2) (b)(i) D an equal positive (1) charge (b)(ii) an explanation charge/electrons linking any two of move accept friction (between balloon gains cloth and balloon) (1) electrons from the transfer of electrons cloth for 2 marks (1) (electrons/negative charges move) from cloth to balloon (1) (2) (b)(iii) a description earthed / neutral including two from (negative) charge for the following: electrons accept electrons move to balloon becomes earth for 2 marks discharged (1) metal /cabinet is a conductor (1) electrons move through / on to metal / cabinet (1) (2) (b)(iv) (surface of) wall charges on the wall (becomes) positively separate charge charged /charged by closest to the surface induction (1) of the wall is opposite to the charge on the balloon (1) Q5. Answer Acceptable Mark answers (i) Correct responses (2) can be seen in (i) or ["positive electrons/ (ii) protons moving", An explanation seen anywhere in linking part (i) or (ii) loses this mark] ignore reference to charge electrons
terminology accurately spelling, punctuation and grammar are used with few errors Q4. Answer Acceptable answers Mark (a) an explanation linking: balloons repel (1) (because) they have like charges (1) balloons repulse / push away (from each other/to the side) same charge / both positive / both negative accept like charges repel for 2 marks (2) (b)(i) D an equal positive charge (1) (b)(ii) an explanation linking any two of friction (between cloth and balloon) (1) transfer of electrons (1) (electrons/negative charges move) from cloth to balloon (1) charge/electrons move accept balloon gains electrons from the cloth for 2 marks (2) (b)(iii) a description including two from the following: balloon becomes discharged (1) metal /cabinet is a conductor (1) electrons move through / on to metal / cabinet (1) earthed / neutral (negative) charge for electrons accept electrons move to earth for 2 marks (2) (b)(iv) (surface of) wall (becomes) positively charged /charged by induction (1) charges on the wall separate charge closest to the surface of the wall is opposite to the charge on the balloon (1) Q5. Answer Acceptable answers Mark (i) Correct responses can be seen in (i) or (ii) An explanation linking electrons ["positive electrons/ protons moving", seen anywhere in part (i) or (ii) loses this mark] ignore reference to charge (2)
11_20160124221326_P2_static_electricity_Q's_v1.docx