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Electromagnets and Their Applications — Free MYP1 Sciences Practice Questions
1QuestionFactors Affecting Electromagnet StrengthConcept Practice
2 marks~3 minCriterion D
A scrapyard crane uses an electromagnet to lift cars. The crane operator can change the number of wire coils on the electromagnet.
a
State what happens to the strength of the electromagnet when the number of wire coils is increased. [1]
b
Describe how being able to change the number of coils makes the crane more useful in a scrapyard. [1]
Solutions
2QuestionComparing Magnets and ElectromagnetsConcept Practice
3 marks~5 minCriterion A
The diagram shows a bar magnet and an electromagnet. Both attract the same number of paperclips.
a
Name the part of the electromagnet that can be switched on or off to control its magnetism. [1]
b
Describe how the iron core helps the electromagnet work. [1]
c
Give one difference between how a bar magnet and an electromagnet produce their magnetism. [1]
Solutions
3QuestionMaking an ElectromagnetConcept Practice
4 marks~6 minCriterion B
Two electromagnets are made by wrapping wire around an iron nail and connecting it to a battery.
Electromagnet A: 5 coils → lifts 2 paperclips
Electromagnet B: 15 coils → lifts 6 paperclips
Electromagnet A: 5 coils → lifts 2 paperclips
Electromagnet B: 15 coils → lifts 6 paperclips
a
Identify what is being changed between Electromagnet A and Electromagnet B. [1]
b
Describe what happens to the lifting strength as the number of coils increases. Use the numbers above in your answer. [2]
c
Electromagnet A lifts 2 paperclips. Electromagnet B has three times as many coils. Compare the lifting strength of the two electromagnets and suggest why the one with more coils is stronger. [1]
Solutions
4QuestionComparing Magnets and ElectromagnetsConcept Practice
3 marks~5 minCriterion C
An electromagnet is made by wrapping wire around a nail and connecting it to a battery. The table below shows how many paper clips it picks up with different numbers of coils. A permanent magnet always picks up 6 paper clips.
| Number of coils | 5 | 10 | 15 | 20 |
|---|---|---|---|---|
| Paper clips picked up | 2 | 5 | 8 | 11 |
a
Identify one thing that happens to the electromagnet's strength as the number of coils increases. [1]
b
Describe what the data shows about the number of paper clips the electromagnet picks up as more coils are added. [1]
c
Compare the strength of the electromagnet with the strength of the permanent magnet at 15 coils. Use the data to support your answer. [1]
Solutions
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