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Electromagnets and Their Applications — Free MYP3 Sciences Practice Questions
1QuestionFactors Affecting Electromagnet StrengthConcept Practice
2 marks~3 minCriterion B
An electromagnet is made by wrapping wire around an iron nail and connecting it to a battery. In Setup A, the wire is wrapped 10 times. In Setup B, the same wire and battery are used, but the wire is wrapped 20 times.
Describe the pattern in the strength of the magnetic field as the number of coils in the electromagnet is increased. [2]
Describe the pattern in the strength of the magnetic field as the number of coils in the electromagnet is increased. [2]
Solutions
2QuestionMagnetic Relays and Electromagnetic DevicesAssessment Practice
5 marks~8 minCriterion D
A manufacturer claims a magnetic relay operates reliably when the current through its coil exceeds . A technician tests the relay at four current levels, recording successful switch cycles out of 1000 trials.
| Current (A) | 0.5 | 1.0 | 1.5 | 2.0 |
|---|---|---|---|---|
| Successful cycles | 420 | 950 | 985 | 992 |
a
Calculate the percentage of successful cycles at each current level. [2]
b
Explain what the result at shows about relay performance below . [1]
c
Analyse the full set of results and evaluate whether the experimental data supports the manufacturer's claim. [2]
Solutions
3QuestionComparing Magnets and ElectromagnetsConcept Practice
2 marks~3 minCriterion A
The diagram below shows a simple electromagnet.
a
Identify the component that becomes magnetised when electric current flows through the coil. [1]
b
Explain why this component loses its magnetism when the current is switched off. [1]
Solutions
4QuestionMaking an ElectromagnetAssessment Practice
6 marks~9 minCriterion C
Students investigate how the number of turns of wire around an iron nail affects the strength of an electromagnet. The same nail, battery, and wire are used throughout. Paperclips picked up measure the electromagnet's strength.
| Number of turns | 10 | 20 | 30 | 40 |
|---|---|---|---|---|
| Number of paperclips | 4 | 8 | 12 | 16 |
a
Calculate the number of paperclips picked up for every 10 turns of wire. [1]
b
Explain why increasing the number of turns increases the strength of the electromagnet. [2]
c
A student predicts that 50 turns will pick up 20 paperclips. Analyse the data and the scientific reasoning to justify whether this prediction is correct. [3]
Solutions
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