AQA
A-
level PH z
YSICS 74 z
08/2
Paper 2 z
Question Paper + Mark scheme (Merged) June 2
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021
Version: 1.0 Final
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, Please write clearly in block capitals.
Centre number Candidate number
Surname
Forename(s)
Candidate signatu re
I declare this is my own work.
A-level
PHYSICS
Paper 2 z
Time allowed: 2 hours
z z z
Materials For Examiner’s Use
For this paper you must have:
z z z z z
• a pencil and a ruler
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Question Mark
• a scientific calculator
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• a Data and Formulae Booklet
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2
• a protractor.
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3
Instructions 4
• Use black ink or black ball-point pen.
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5
• Fill in the boxes at the top of this page.
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• Answer all questions. z z
6
• You must answer the questions in the spaces provided. Do not write ou
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tside the box around each page or on blank pages.
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TOTAL
• If you need extra space for your answer(s), use the lined pages at the end of thi
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s book. Write the question number against your answer(s).
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• Do all rough work in this book. Cross through any work you do not want to
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be marked. z
• Show all your working. z z z
Information
• The marks for questions are shown in brackets.
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• The maximum mark for this paper is 85.
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• You are expected to use a scientific calculator where appropriate.
z z z z z z z z z
• A Data and Formulae Booklet is provided as a loose insert.
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IB/M/Jun21/E7 7408/2
, 2
Do not write
outside the
Section A z box
Answer all questions in this section.
z z z z z
0 1 A capacitor of capacitance 63 pF is made from two parallel metal plates separated by an a
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ir gap.
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The capacitor is charged so that it stores a charge of 7.6 × 10−10 C; it is then isolated.
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A sheet of mica of dielectric constant 6.0 is inserted between the plates so that it complet
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ely fills the space between them. The mica does not discharge the capacitor and does no
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t change the separation of the plates.
z z z z z z
0 1
. 1
z Explain what is meant by a dielectric constant of 6.0
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[1 mark]
z
0 1 . 2
z Mica is made up of polar molecules. As the mica is inserted, the capacitance of the
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capacitor changes. z
Explain how the polar molecules cause this change in capacitance.
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[3 marks]
z
IB/M/Jun21/7408/2
, 3
Do not write
outside the
0 1 . 3
z Calculate the difference between the initial energy stored by the capacitor and the energy
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box
stored when the mica has been fully inserted.
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[3 marks] z
energy difference =
z z z z J
Question 1 continues on the next page
z z z z z z
Turn over ►
z z
IB/M/Jun21/7408/2
A-
level PH z
YSICS 74 z
08/2
Paper 2 z
Question Paper + Mark scheme (Merged) June 2
z z z z z z z
021
Version: 1.0 Final
z z
, Please write clearly in block capitals.
Centre number Candidate number
Surname
Forename(s)
Candidate signatu re
I declare this is my own work.
A-level
PHYSICS
Paper 2 z
Time allowed: 2 hours
z z z
Materials For Examiner’s Use
For this paper you must have:
z z z z z
• a pencil and a ruler
z z z z
Question Mark
• a scientific calculator
z z 1
• a Data and Formulae Booklet
z z z z
2
• a protractor.
z
3
Instructions 4
• Use black ink or black ball-point pen.
z z z z z z
5
• Fill in the boxes at the top of this page.
z z z z z z z z z
• Answer all questions. z z
6
• You must answer the questions in the spaces provided. Do not write ou
z z z z z z z z z z z z 7–31
tside the box around each page or on blank pages.
z z z z z z z z z
TOTAL
• If you need extra space for your answer(s), use the lined pages at the end of thi
z z z z z z z z z z z z z z z z
s book. Write the question number against your answer(s).
z z z z z z z z
• Do all rough work in this book. Cross through any work you do not want to
z z z z z z z z z z z z z z z z
be marked. z
• Show all your working. z z z
Information
• The marks for questions are shown in brackets.
z z z z z z z
• The maximum mark for this paper is 85.
z z z z z z z
• You are expected to use a scientific calculator where appropriate.
z z z z z z z z z
• A Data and Formulae Booklet is provided as a loose insert.
z z z z z z z z z z
IB/M/Jun21/E7 7408/2
, 2
Do not write
outside the
Section A z box
Answer all questions in this section.
z z z z z
0 1 A capacitor of capacitance 63 pF is made from two parallel metal plates separated by an a
z z z z z z z z z z z z z z z z
ir gap.
z
The capacitor is charged so that it stores a charge of 7.6 × 10−10 C; it is then isolated.
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A sheet of mica of dielectric constant 6.0 is inserted between the plates so that it complet
z z z z z z z z z z z z z z z z
ely fills the space between them. The mica does not discharge the capacitor and does no
z z z z z z z z z z z z z z z
t change the separation of the plates.
z z z z z z
0 1
. 1
z Explain what is meant by a dielectric constant of 6.0
z z z z z z z z z
[1 mark]
z
0 1 . 2
z Mica is made up of polar molecules. As the mica is inserted, the capacitance of the
z z z z z z z z z z z z z z z
capacitor changes. z
Explain how the polar molecules cause this change in capacitance.
z z z z z z z z z
[3 marks]
z
IB/M/Jun21/7408/2
, 3
Do not write
outside the
0 1 . 3
z Calculate the difference between the initial energy stored by the capacitor and the energy
z z z z z z z z z z z z z z
box
stored when the mica has been fully inserted.
z z z z z z z
[3 marks] z
energy difference =
z z z z J
Question 1 continues on the next page
z z z z z z
Turn over ►
z z
IB/M/Jun21/7408/2
