2025 AQA A-LEVEL PHYSICS Paper 3 Section B
Engineering Physics Question Paper & Mark
Scheme (Merged) Tuesday 17 June 2025
[VERIFIED]
Time allowed: The total time for
both sections of this paper i
...
2025 AQA A-LEVEL PHYSICS Paper 3 Section B
Engineering Physics Question Paper & Mark
Scheme (Merged) Tuesday 17 June 2025
[VERIFIED]
Time allowed: The total time for
both sections of this paper is
2 hours. You are advised to
spend approximately
50 minutes on this section.
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 35.
You are expected to use a scientific calculator where appropriate.
A Data and Formulae Booklet is provided as a loose insert.
IB/M/Jun25/G4006/E7
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For Examiner’s Use
Question Mark
1
2
3
4
TOTAL
2
Do not write
outside the
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IB/M/Jun25/7408/3BC
Section B
Answer all questions in this section.
box
The rotating part of an electric motor is called the rotor.
Figure 1 shows an end view of a rotor turning clockwise due to a driving torque from
the motor. In this question, the clockwise direction is treated as positive.
Figure 1 Figure 2
The rotor can be brought to rest rapidly by reversing the electrical supply connections
to the motor. Figure 2 shows the rotor at time t = 0 when the supply connections are
reversed.
The rotor then slows down due to a constant anticlockwise retarding torque so that it
stops at time t = t1.
The angular velocity of the rotor at t = 0 is 98.0 rad s−1 clockwise.
The applied torque on the rotor at t = 0 is anticlockwise.
The applied torque produces a constant angular acceleration of −303 rad s−2.
Friction torque is negligible.
. Determine t1.
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