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Electromagnets and Their Applications — Free MYP2 Sciences Practice Questions
1QuestionComparing Magnets and ElectromagnetsConcept Practice
2 marks~3 minCriterion A
The diagram below shows an electromagnet with four labeled components:
A: Coil of wire
B: Iron core
C: Battery
D: Switch
A: Coil of wire
B: Iron core
C: Battery
D: Switch
a
Identify the component that becomes magnetized when current flows through the coil. [1]
b
Explain one reason why using an iron core makes the electromagnet stronger than one with no core. [1]
Solutions
2QuestionComparing Magnets and ElectromagnetsAssessment Practice
4 marks~6 minCriterion D
A scrapyard uses a large electromagnet to lift and drop heavy scrap metal. A student suggests that a permanent magnet could be a more energy-efficient alternative.
a
Identify one advantage of using an electromagnet in this scrapyard application. [1]
b
Explain one disadvantage of using an electromagnet in this application. [1]
c
Compare an electromagnet and a permanent magnet for this application, and explain why a permanent magnet is not suitable. [2]
Solutions
3QuestionFactors Affecting Electromagnet StrengthAssessment Practice
4 marks~6 minCriterion B
A student tests an electromagnet at a constant voltage of 6 V, changing only the number of wire turns (coils around the iron core). The bar chart shows the results.
| Number of turns | 10 | 20 | 30 | 40 |
|---|---|---|---|---|
| Paper clips picked up | 5 | 12 | 18 | 24 |
a
Describe the relationship between the number of wire turns and the number of paper clips picked up. Use data from the chart to support your answer. [2]
b
Estimate the number of paper clips a 50-turn electromagnet would pick up, and explain how you used the data to reach your answer. [2]
Solutions
4QuestionMaking an ElectromagnetAssessment Practice
6 marks~9 minCriterion C
A student wraps wire around an iron nail and connects it to a battery to make an electromagnet. They count how many paperclips it lifts for different numbers of coils. Results are shown in the graph below.
| Number of coils | 0 | 10 | 20 | 30 | 40 |
|---|---|---|---|---|---|
| Number of paperclips | 0 | 3 | 5 | 8 | 11 |
a
Calculate the average increase in paperclips lifted for every 10 extra coils. [2]
b
Identify whether the relationship between the number of coils and the number of paperclips is linear (forms a straight line). Give one reason using values from the data. [2]
c
A second student says: "With 50 coils, the electromagnet will lift exactly 20 paperclips." Using your answer from (a), estimate the number of paperclips the electromagnet would lift with 50 coils and explain whether the second student is correct. [2]
Solutions
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