Edexcel IGCSE Physics C Electromagnetism Questions
Practise electromagnetism questions using current-produced fields, solenoids, motors, force directions and field-strength graphs.
- Syllabus
- First assessment 2019
- Course
- Physics 4PH1
Exam points
- link current in a wire or solenoid to magnetic field patterns shown by compasses or filings
- use the left-hand rule and field diagrams to determine force directions on charges or wires
- interpret force-current graphs and motor diagrams involving brushes and split-ring commutators
Covered syllabus points
Question 1
The diagrams show some equipment that the physicist Ørsted used in an investigation in 1820.
Diagram 1 shows the position of eight compass needles around a wire with no current in the wire.
The compass needles line up with and show the direction of the Earth's magnetic field lines.
Diagram 2 shows the position of the same compass needles when a current is in the wire.
Question (a)
(a)
Explain why the compass needles turn when the current is switched on.
Question (b)
(b)
Using evidence from the compass needles in diagram 2, draw on diagram 2 the shape and direction of a magnetic field line produced by the current in the wire.
Question (c)
(c)
Suggest what happens to the magnetic field when the current in the wire is reversed.
Question (d)
(d)
The current in the wire is turned off.
Diagram 3 shows the wire placed in a uniform magnetic field.
Diagram 3
The current is now switched on.
Draw an arrow to show the direction of the force on the wire.
Question 2
Magnetic Resonance Imaging (MRI) machines can take scans of the inside of a patient.
There is an electromagnet inside the MRI machine.
Describe the construction of an electromagnet.
You may draw a diagram to help your answer.
Question 3
The diagram shows a machine that can be used to measure the speed of fast-moving protons.
The proton passes through a hole in the negatively charged plate and enters an area where there is a magnetic field.
The magnetic field exerts a force on the proton, as shown in the diagram.
This force causes the proton to follow a circular path without changing speed.
Give the direction of the magnetic field.
Question 4
The diagrams show some equipment that the physicist Ørsted used in an investigation in 1820.
Diagram 1 shows the position of eight compass needles around a wire with no current in the wire.
The compass needles line up with and show the direction of the Earth's magnetic field lines.
Diagram 2 shows the position of the same compass needles when a current is in the wire.
Explain why the compass needles turn when the current is switched on.
Question 5
Diagram 1 shows some apparatus used to demonstrate the magnetic force on a current-carrying wire in a magnetic field.
Diagram 1
The wire has a mass of 6.5 g .
Explain how the circuit could be changed to make the wire vibrate.
Question 6
Diagram 1 shows some apparatus used to demonstrate the magnetic force on a current-carrying wire in a magnetic field.
Diagram 1
Diagram 2 shows four different arrangements of the apparatus.
The symbol - shows that the current is directed out of the page.
Which arrangement of the apparatus will cause there to be an upwards magnetic force on the wire?
A
W
B
X
C
Y
D
Z
Question 7
Diagram 1 shows some apparatus used to demonstrate the magnetic force on a current-carrying wire in a magnetic field.
Diagram 1
The wire has a mass of 6.5 g .
Explain one method of increasing the magnitude of the magnetic force on the wire.
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