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Magnets and Magnetic Fields — Free MYP2 Sciences Practice Questions
1QuestionDrawing Magnetic Field LinesConcept Practice
2 marks~3 minCriterion A
The diagram shows a bar magnet with its north pole (N) on the left and south pole (S) on the right. Four arrows show possible directions of magnetic field lines outside the magnet: Arrow A points from N to S above the magnet, Arrow B points from S to N above the magnet, Arrow C points from N to S below the magnet, and Arrow D points from S to N below the magnet.
a
Identify which arrow or arrows correctly show the direction of a magnetic field line outside the magnet. [1]
b
Explain why the other arrows are incorrect, using the rule for magnetic field line direction. [1]
Solutions
2QuestionDrawing Magnetic Field LinesAssessment Practice
3 marks~5 minCriterion B
The table below shows the magnetic field strength at different distances from the north pole of a bar magnet.
| Distance (cm) | 0 | 2 | 4 | 6 | 8 |
|---|---|---|---|---|---|
| Field strength (units) | 100 | 45 | 20 | 9 | 4 |
a
Identify the trend shown in the table. [1]
b
Explain why the magnetic field strength decreases as distance increases. Use the concept of magnetic field lines in your answer. [1]
c
Compare the rate of decrease in field strength between 0–4 cm and 4–8 cm. What does this tell you about how magnetic field lines are arranged near the pole? [1]
Solutions
3QuestionDrawing Magnetic Field LinesAssessment Practice
5 marks~8 minCriterion C
A compass needle points in the direction of the magnetic field at that location. Outside a bar magnet, field lines run from the north pole to the south pole.
Three compasses are placed around a bar magnet (north pole on the left, south pole on the right) at points P, Q, and R.
Compass readings (degrees clockwise from north):
Point P (beside the north pole):
Point Q (above the middle):
Point R (below the south pole):
A student drew field lines that curve smoothly from left to right at all three points.
Three compasses are placed around a bar magnet (north pole on the left, south pole on the right) at points P, Q, and R.
Compass readings (degrees clockwise from north):
Point P (beside the north pole):
Point Q (above the middle):
Point R (below the south pole):
A student drew field lines that curve smoothly from left to right at all three points.
a
State the direction a compass needle points at a location on a magnetic field line. [1]
b
Identify which point or points have compass readings that are inconsistent with field lines running from north pole to south pole. Give one reason for each point you identify. [3]
c
Compare the compass reading at point P with the reading at point R. Explain what this tells you about the direction of the field at each location. [1]
Solutions
4QuestionTemporary vs Permanent MagnetsAssessment Practice
6 marks~9 minCriterion D
A student is designing a magnetic latch for a cabinet door. The latch must hold the door closed only when a button is pressed.
An electromagnet is a temporary magnet — it is magnetic only when electric current flows through it.
An electromagnet is a temporary magnet — it is magnetic only when electric current flows through it.
a
Identify one advantage of using an electromagnet for this latch. [1]
b
Explain one disadvantage of using an electromagnet for this latch. [2]
c
Compare using an electromagnet with using a permanent magnet for this latch, and state which is more suitable. [3]
Solutions
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