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Magnets and Magnetic Fields — Free MYP3 Sciences Practice Questions
1QuestionDrawing Magnetic Field LinesConcept Practice
2 marks~3 minCriterion A
A bar magnet has its north (N) and south (S) poles labelled. A compass is placed near the north pole, with its needle initially pointing east–west.
a
State the direction in which the compass needle points when placed near the north pole of the magnet. [1]
b
Explain why the compass needle points in this direction, referring to the direction of magnetic field lines outside a bar magnet. [1]
Solutions
2QuestionEarth Magnetic Field IntroductoryAssessment Practice
5 marks~8 minCriterion B
The table below shows the magnetic declination — the angle between true north and magnetic north — for three cities.
| City | London | Tokyo | Sydney |
|---|---|---|---|
| Declination (degrees east) |
a
Describe what magnetic declination tells you about the direction a compass needle points at a given location. [1]
b
Explain why a compass needle does not point to true north at every location on Earth. In your answer, use the terms magnetic north, true north, and magnetic field lines, and refer to at least two cities from the table. [2]
c
Analyse the data to identify a pattern in the declination values and propose one scientific reason for this variation. [2]
Solutions
3QuestionMagnetic Poles and Their InteractionAssessment Practice
5 marks~8 minCriterion C
The diagram shows iron filings arranged around a bar magnet, with three compasses at positions A, B, and C. At position A (near the north pole), the needle points away from the north pole. At position B (near the south pole), the needle points toward the south pole. At position C, the needle points clockwise from the direction of the magnetic field line at that location.
a
State the direction of magnetic field lines outside a bar magnet. [1]
b
Explain whether the compass readings at positions A and B are consistent with the expected magnetic field pattern. [2]
c
Calculate the angle difference between the expected and observed compass directions at position C, and analyse whether this reading is consistent with the magnetic field pattern shown by the iron filings. [2]
Solutions
4QuestionDrawing Magnetic Field LinesAssessment Practice
8 marks~12 minCriterion D
Magnetic Resonance Imaging (MRI) uses strong magnetic fields to produce detailed images of soft tissues such as the brain, muscles, and organs — without using X-rays. MRI machines cost millions of dollars, require specially trained staff, and cannot be used by patients with metal implants or severe claustrophobia. In many low-income countries, only one or two MRI machines serve the entire population.
a
Describe one benefit of MRI for medical diagnosis. [1]
b
Explain one societal concern associated with the limited availability of MRI machines. [2]
c
A hospital records the following data on MRI usage and patient outcomes over one year:
Patients correctly diagnosed using MRI: 840 out of 1000
Patients who could not use MRI due to metal implants or claustrophobia: 160 out of 1000
Average cost per MRI scan: 1200 dollars
Average cost per X-ray scan: 80 dollars
Using the data, analyse whether MRI is a worthwhile technology for this hospital. In your answer, refer to both the diagnosis rate and the cost difference. [5]
Patients correctly diagnosed using MRI: 840 out of 1000
Patients who could not use MRI due to metal implants or claustrophobia: 160 out of 1000
Average cost per MRI scan: 1200 dollars
Average cost per X-ray scan: 80 dollars
Using the data, analyse whether MRI is a worthwhile technology for this hospital. In your answer, refer to both the diagnosis rate and the cost difference. [5]
Solutions
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