A square coil has sides of length l and carries a current I, as shown. The plane of the
coil is parallel to a magnetic field of flux density B.
Q R
magnet magnet
coil
P S
North I South
Which row of the table gives the magnetic force on the named side of the coil?
Named side Magnetic force
A PQ BIl to the left
B QR BIl to the right
C RS BIl upwards
D SP BIl downwards
(Total for Question 6 = 1 mark)
Turn over
PMT
(c) Describe the role of the magnetic field in a particle detector.
(3)
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(d) Explain how the diagram gives evidence that a particle or particles, other than the
positron, were produced in this decay.
(4)
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(Total for Question 14 = 11 marks)
*P74468A01124*
Question
Physics
Edexcel2024
RC
F = mrω2
In a magnetic field
Fields
F = BIl sin θ
Coulomb’s law
F = Bqv sin θ
Q Q
F = 1 2
4πε r2
Question
Physics
Edexcel2024
Capacitance
Q
C =
V
PMT
Nuclear and particle physics Radioactive decay
A = λN
In a magnetic field
dN
p = −λN
r = dt
BQ
ln 2
λ =
t
½
Thermodynamics
N = N e−λt
Heating 0
A = A e−λt
RC
F = mrω2
In a magnetic field
Fields
F = BIl sin θ
Coulomb’s law
F = Bqv sin θ
Q Q
F = 1 2
4πε r2
Question
Physics
Edexcel2023
B t = ln
Question
Physics
Edexcel2023
Capacitance
Q
C =
V
*P71915A02628*
DO
NOT
WRITE
IN
THIS
AREA
DO
NOT
WRITE
IN
THIS
AREA
DO
NOT
WRITE
IN
THIS
AREA
AERA
SIHT
NI
ETIRW
TON
OD
AERA
SIHT
NI
ETIRW
TON
OD
AERA
SIHT
NI
ETIRW
TON
OD
PMT
Nuclear and particle physics Radioactive decay
A = λN
In a magnetic field
dN
p = −λN
r = dt
BQ
ln 2
λ =
t ½
Thermodynamics
N = N e−λt
Heating 0
A = A e−λt
Question
Physics
Edexcel2022
*P69306A02728*
PMT
Nuclear and particle physics Radioactive decay
A = λN
In a magnetic field
dN
p = −λN
r = dt
BQ
ln 2
λ =
t
½
Thermodynamics
N = N e−λt
Heating 0
A = A e−λt
The screen is viewed by an observer at point X in the diagram above. A magnetic field
is directed at the beam of electrons. This causes the shadow to move upwards on the
screen in the direction OM.
M
O
Q N
P
In which of the following directions is the magnetic field acting as seen by
this observer?
A OM
B ON
C OP
D OQ
(Total for Question 5 = 1 mark)
Question
Physics
Edexcel2022
RC
F = mrω2
In a magnetic field
Fields
F = BIl sin θ
Coulomb’s law
F = Bqv sin θ
Q Q
F = 1 2
4πε r2
Question
Physics
Edexcel2021
*P67096A03132*
PMT
Nuclear and particle physics Radioactive decay
A = λN
In a magnetic field
dN
p = −λN
r = dt
BQ
ln 2
λ =
t
½
Thermodynamics
N = N e−λt
Heating 0
A = A e−λt
Question
Physics
Edexcel2021
RC
F = mrω2
In a magnetic field
Fields
F = BIl sin θ
Coulomb’s law
F = Bqv sin θ
Q Q
F = 1 2
4πε r2
Question
Physics
Edexcel2021
*P67096A02532*
Turn over
PMT
(ii) Show that the moment M on the coil about the pivot, due to the magnetic field,
is given by
M = BAIN
where
A is the cross-sectional area of the coil
N is the number of turns of wire on the coil.
(4)
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Question
Physics
Edexcel2021
The diagrams show the plan view and side view of a moving coil ammeter.
Plan view Side view
scale
coil
I
B
pointer
soft iron cylinder soft iron
pivot
N l S
cylinder
B
w
N S
pivot
magnet magnet
moving coil
The fixed soft iron cylinder and magnets produce a uniform magnetic field of magnetic
flux density B. The coil is able to rotate within this magnetic field. The coil has width
w and length l. There is a current I in the coil in the direction shown in the side view
diagram.
(a) (i) Explain which way the coil will rotate.
(2)
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Question
Physics
Edexcel2020
RC
F = mrω2
In a magnetic field
Fields
F = BIl sin θ
Coulomb’s law
F = Bqv sin θ
Q Q
F = 1 2
4πε r2
Question
Physics
Edexcel2020
*P61864RA02328*
Turn over
PMT
(c) According to the standard model, the pion and muon are classified within two
different groups of particles.
State which group each particle belongs to and describe the two groups.
(4)
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(d) The momentum of the pion just before it decays is 9.1 × 10 −20 N s.
Determine the magnetic flux density of the magnetic field which acts in the detector
and state its direction.
Scale of diagram 1 cm represents 10 cm
pion charge = −1.6 × 10 −19 C
(4)
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Magnetic flux density =
......................................................
Direction of magnetic field =
...............................................................................................................................
Question
Physics
Edexcel2020
*P61864RA02828*
PMT
Nuclear and particle physics Radioactive decay
A = λN
In a magnetic field
dN
p = −λN
r = dt
BQ
ln 2
λ =
t
½
Thermodynamics
N = N e−λt
Heating 0
A = A e−λt