AJC_H2_PHY_P4_Q_Soln

9749/04/AJC/2017/Prelim [Turn Over 1 Name: _____________________________ ( ) PDG: ______/ 16 2017 JC2 Preliminary Examination PHYSICS Higher 2 9749/04 Paper 4 Practical Friday 25 August 2017 2 hours 30 minutes Candidates answer on the Question Paper. Additional Materials: As listed on the Confidential Instructions READ THESE INSTRUCTIONS FIRST Write your name, class index number and PDG in the spaces provided above. Write in dark blue or black pen on both sides of the paper. You may use an HB pencil for any diagrams, graphs or rough working. Do not use staples, paper clips, glue or correction fluid. Answer all questions. Write your answers in the spaces provided on the question paper. The use of an approved scientific calculator is expected, where appropriate. You may lose mark if you do not show your working or if you do not use appropriate units. Give details of the practical shift and laboratory where appropriate in the boxes provided. At the end of the examination, fasten all your work securely together. The number of marks is given in brackets [ ] at the end of each question or part question. Shift Laboratory ANDERSON JUNIOR COLLEGE This document consists of 16 printed pages and 0 blank page. For Examiner’s Use Paper 4 (55 marks) 1 2 3 4 Total (55 marks)

9749/04/AJC/2017/Prelim 2 1 In this experiment, you will investigate how the per iod of torsional oscillations of a bar magnet suspended above a fixed bar magnet changes with the separation between the two magnets. (a) (i) Fix one of the magnets to the bench top using Blu-tack. (ii) Suspend a second magnet using a stirrup and thread so that it lies in a horizontal plane about 50 cm below the point of suspension. The distance d between the bottom of the suspended magnet and the top of the fixed magnet should initially be about 5 cm. The base of the stand should be as far as possible from the fixed bar magnet. The arrangement is shown in Fig. 1.1. Fig. 1.1 (b) (i) Measure and record distance d. d = …..…………….…………. [1] (ii) Estimate the percentage uncertainty in d, showing your working. percentage uncertainty =…..…………….…………. [1] For Examiner’s Use M1 about 50 cm cotton suspended bar magnet fixed bar magnet point of suspension small block of wood d A1 about 50 cm cotton suspended bar magnet fixed bar magnet using blu-tack point of suspension small block of wood d

9749/04/AJC/2017/Prelim [Turn Over 3 (iii) Gently rotate the suspended magnet and release it so that it pe