Edexcel IGCSE Physics (c) Electromagnetism Question Bank
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
(c) Electromagnetism 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.
[ 2 ]
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.
[ 2 ]
Question (c)
(c)
Suggest what happens to the magnetic field when the current in the wire is reversed.
[ 1 ]
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.
[ 2 ]
(c) Electromagnetism 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.
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