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# Advanced GCE Physics A H556/03: Unified Physics. Mark Scheme for November 2020.

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OCR Advanced GCE Physics A H556/03: Unified Physics. Mark Scheme for November 2020. H556/03 Mark Scheme November 2020 5 General rule: For substitution into an equation, allow any subject – unles... s stated otherwise in the guidance Question Answer Marks Guidance 1 (a) (i) F = QE = QV/d or E = 5(.0) x 104 (Vm-1) F = 9.0 x 10-9 x 4000/ 8.0 x 10-2 (= 4.5 x 10-4 N) C1 A1 F = 5.0 x 104 x 9.0 x 10-9 (ii) weight; arrow vertically downwards tension; arrow upwards in direction of string electric (force); arrow horizontally to the right (not along dotted line) B1 x 2 All correct, 2 marks; 2 correct, 1 mark 1 mark maximum if more than 3 arrows are drawn Ignore position of arrows Allow W or 0.030(N) (not gravity or g) Allow T Allow F or E or 4.5 x 10-4(N) or electrostatic Ignore repulsion or attraction Not electric field / electric field strength / electromagnetic (iii) W x = F l 0.03 x = 4.5 x 10-4 x 120 or = 4.5 x 10-4 x 1.2 x = 1.8 cm or x = 0.018 m M1 M1 A0 Allow any valid alternative approach e.g. M1 deflection angle θ = 1o M1 x = 120sinθ 1 mark for each side of the equationH556/03 Mark Scheme November 2020 6 (b) Electric force/field (strength) increases Ball deflected further from vertical / moves to the right / touches negative plate Ball acquires the charge of the (negative) plate when it touches (Oscillates because) constantly repelled from (oppositely) charged plate B1 B1 B1 B1 Must be clear which force is increasing Must have the idea of a repeating cycle (c) I = Qf or Q = It f = 3.2 x 10-8/9.0 x10-9 = 3.6 (Hz) C1 A1 [Show More]

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