2024 RI Prelim H2 Phy Paper 3 Sect B

This document consists of 12 printed pages. © Raffles Institution 9749/03 [Turn over Centre Number Index Number Name Class S3016 RAFFLES INSTITUTION 2024 Preliminary Examination PHYSICS Higher 2 Paper 3 Longer Structured Questions 9749/03 18 September 2024 2 hours Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your index number, name and class in the spaces at the top of this page. Write in dark blue or black pen in the spaces provided in this booklet. You may use pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. The use of an approved scientific calculator is expected, where appropriate. Section A Answer all questions. Section B Answer one question only and circle the question number on the cover pages. You are advised to spend one and half hours on Section A and half an hour on Section B. The number of marks is given in brackets [ ] at the end of each question or part question. *This booklet only contains Section B. For Examiner’s Use Section B (circle 1 question) 8 / 20 9 / 20 Deduction

2 © Raffles Institution 9749/03 [Turn over Section B Answer one question from this section in the spaces provided. 8 A research facility located in the northern hemisphere is used to study the effects of the solar wind from the Sun. At its location, the Earth’s magnetic field is found to have a magnetic flux density of 55.2 10 T− at an angle of 70 below the horizontal. (a) A vertical window at the research facility has an aluminium frame ABCD with length 80 cm and width 55 cm, as shown in Fig. 8.1. Fig. 8.1 The window is hinged along the side AB. When the window is closed as in Fig. 8.1, the horizontal component of the Earth’s magnetic flux density is directed normally into the plane of the window. (i) Calculate the magnetic flux through the window when it is closed. magnetic flux = Wb [2] A C B D 55 cm 80 cm aluminium frame horizontal component of Earth’s magnetic flux density into plane of paper hinges

3 © Raffles Institution 9749/03 [Turn over (ii) The window is opened by pushing it into the plane of the paper in a time of 0.30 s. When fully opened, the plane of the window is parallel to the horizontal component of the Earth’s magnetic flux density. During the opening of the window, 1. use the laws of electromagnetic induction to explain why there is a current induced in the aluminium frame, [3] 2. determine the change in the magnetic flux through the window, magnetic flux = Wb [1] 3. calculate the magnitude of the average e.m.f. induce