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 3
Section B Turning points in physics
Monday 8 June 2026 Morning Time allowed: The total time for
both sections of this paper is
Materials 2 hours. You are advised to
For this paper you must have:
• a pencil and a ruler spend approximately
• a scientific calculator 50 minutes on this section.
• a Data and Formulae Booklet
• a protractor.
Instructions For Examiner’s Use
• Use black ink or black ball-point pen.
Question Mark
• Fill in the boxes at the top of this page.
• Answer all questions. 1
• You must answer the questions in the spaces provided. Do not write 2
outside the box around each page or on blank pages.
3
• 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). 4
• Do all rough work in this book. Cross through any work you do not want TOTAL
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.
, 2
Do not write
outside the
Section B box
Answer all questions in this section.
0 1 Figure 1 shows part of an arrangement that is used to measure the specific charge of
the electron. The path of an electron beam is observed on a screen.
Figure 1
The horizontal plates have a vertical separation of 5.0 cm.
A potential difference of 147 V is applied across the plates, creating a uniform
electric field between them.
A value for the speed of the electrons is required. To measure this value, a uniform
magnetic field is now applied between the plates and is adjusted until the electron
beam is undeflected. This magnetic field is directed out of the page.
The speed of the electrons is 9.6 × 106 m s−1.
0 1 . 1 Calculate the magnetic flux density when the electron beam is undeflected.
[2 marks]
magnetic flux density = T
, 3
Do not write
outside the
0 1 . 2 The magnetic field is turned off. box
The deflection of the electrons between the plates is 2.0 cm.
Show, using only the data in Question 01, that the vertical acceleration of each
electron in the beam is about 5 × 1014 m s−2.
length of horizontal plates = 8.5 cm
[2 marks]
0 1 . 3 Determine, using only the data in Question 01, the specific charge of the electron.
[2 marks]
specific charge of the electron = C kg−1
Question 1 continues on the next page
, 4
Do not write
outside the
0 1 . 4 The speed of the electrons is increased to 0.60c and the experiment is repeated. box
This produces a value for the specific charge that is significantly different from the
value given in the Data and Formulae Booklet.
Discuss, with a supporting calculation, why this value is significantly different.
In your answer, you should use information about the electron from the Data and
Formulae Booklet.
[4 marks]
10
Centre number Candidate number
Surname
Forename(s)
Candidate signature
I declare this is my own work.
A-level
PHYSICS
Paper 3
Section B Turning points in physics
Monday 8 June 2026 Morning Time allowed: The total time for
both sections of this paper is
Materials 2 hours. You are advised to
For this paper you must have:
• a pencil and a ruler spend approximately
• a scientific calculator 50 minutes on this section.
• a Data and Formulae Booklet
• a protractor.
Instructions For Examiner’s Use
• Use black ink or black ball-point pen.
Question Mark
• Fill in the boxes at the top of this page.
• Answer all questions. 1
• You must answer the questions in the spaces provided. Do not write 2
outside the box around each page or on blank pages.
3
• 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). 4
• Do all rough work in this book. Cross through any work you do not want TOTAL
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.
, 2
Do not write
outside the
Section B box
Answer all questions in this section.
0 1 Figure 1 shows part of an arrangement that is used to measure the specific charge of
the electron. The path of an electron beam is observed on a screen.
Figure 1
The horizontal plates have a vertical separation of 5.0 cm.
A potential difference of 147 V is applied across the plates, creating a uniform
electric field between them.
A value for the speed of the electrons is required. To measure this value, a uniform
magnetic field is now applied between the plates and is adjusted until the electron
beam is undeflected. This magnetic field is directed out of the page.
The speed of the electrons is 9.6 × 106 m s−1.
0 1 . 1 Calculate the magnetic flux density when the electron beam is undeflected.
[2 marks]
magnetic flux density = T
, 3
Do not write
outside the
0 1 . 2 The magnetic field is turned off. box
The deflection of the electrons between the plates is 2.0 cm.
Show, using only the data in Question 01, that the vertical acceleration of each
electron in the beam is about 5 × 1014 m s−2.
length of horizontal plates = 8.5 cm
[2 marks]
0 1 . 3 Determine, using only the data in Question 01, the specific charge of the electron.
[2 marks]
specific charge of the electron = C kg−1
Question 1 continues on the next page
, 4
Do not write
outside the
0 1 . 4 The speed of the electrons is increased to 0.60c and the experiment is repeated. box
This produces a value for the specific charge that is significantly different from the
value given in the Data and Formulae Booklet.
Discuss, with a supporting calculation, why this value is significantly different.
In your answer, you should use information about the electron from the Data and
Formulae Booklet.
[4 marks]
10
