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A-level PHYSICS 7408/2 Paper 2 Question Paper + Mark scheme (Merged) Grade A+

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AQA A-level PHYSICS 7408/2 Paper 2 Question Paper + Mark scheme (Merged) June 2021 Version: 1.0 Final *JUN217408201* IB/M/Jun21/E7 7408/2 For Examiner’s Use Question Mark 1 2 3 4 5 6 7–31 TOTAL Time allowed: 2 hours Materials For this paper you must have: • a pencil and a ruler • a scientific calculator • a Data and Formulae Booklet • a protractor. Instructions • Use black ink or black ball-point pen. • Fill in the boxes at the top of this page. • Answer all questions. • You must answer the questions in the spaces provided. Do not write outside the box around each page or on blank pages. • If you need extra space for your answer(s), use the lined pages at the end of this book. Write the question number against your answer(s). • Do all rough work in this book. Cross through any work you do not want to be marked. • Show all your working. Information • The marks for questions are shown in brackets. • The maximum mark for this paper is 85. • You are expected to use a scientific calculator where appropriate. • A Data and Formulae Booklet is provided as a loose insert. Please write clearly in block capitals. Centre number Candidate number Surname Forename(s) Candidate signature I declare this is my own work. A-level PHYSICS Paper 2 2 *02* IB/M/Jun21/7408/2 Section A Answer all questions in this section. 0 1 A capacitor of capacitance 63 pF is made from two parallel metal plates separated by an air gap. The capacitor is charged so that it stores a charge of 7.6 × 10−10 C; it is then isolated. A sheet of mica of dielectric constant 6.0 is inserted between the plates so that it completely fills the space between them. The mica does not discharge the capacitor and does not change the separation of the plates. 0 1 . 1 Explain what is meant by a dielectric constant of 6.0 [1 mark] 0 1 . 2 Mica is made up of polar molecules. As the mica is inserted, the capacitance of the capacitor changes. Explain how the polar molecules cause this change in capacitance. [3 marks] Do not write outside the box 3 *03* Turn over ► IB/M/Jun21/7408/2 Do not write outside the box 0 1 . 3 Calculate the difference between the initial energy stored by the capacitor and the energy stored when the mica has been fully inserted. [3 marks] energy difference = J Question 1 continues on the next page 4 *04* IB/M/Jun21/7408/2 Do not write outside the box Figure 1 shows the structure of a variable capacitor used for measuring angular movement. The capacitor consists of two semicircular metal plates. These plates are parallel and are separated by an air gap. Figure 1 To vary the capacitance, one of the plates is rotated through an angle θ using the spindle. The other plate remains fixed. 0 1 . 4 Sketch a graph on Figure 2 to show how the capacitance C varies with θ as the spindle is turned through 360°. When θ is 0°, the plates completely overlap. [2 marks] Figure 2 5 *05* Turn over ► IB/M/Jun21/7408/2 Do not write outside the box 0 1 . 5 In one situation, the variable capacitor is too large for the available space. The same maximum capacitance is required using plates that have half the diameter of the original capacitor. Explain, with numerical detail, two ways in which this can be achieved. [3 marks]

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