Figure 4 shows the magnetic field pattern around a permanent magnet - AQA - GCSE Physics Combined Science - Question 4 - 2021 - Paper 2
Question 4
Figure 4 shows the magnetic field pattern around a permanent magnet.
Where is the magnetic field of the magnet the strongest?
How does Figure 4 show that the stren... show full transcript
Worked Solution & Example Answer:Figure 4 shows the magnetic field pattern around a permanent magnet - AQA - GCSE Physics Combined Science - Question 4 - 2021 - Paper 2
Step 1
Where is the magnetic field of the magnet the strongest?
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Answer
The magnetic field of the magnet is strongest at the poles.
Step 2
How does Figure 4 show that the strength of the magnetic field is not the same at all places?
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Answer
Figure 4 illustrates that the distance between the field lines varies, indicating that the strength of the magnetic field is not uniform.
Step 3
Explain one reason why an electromagnet is used instead of a permanent magnet.
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Answer
An electromagnet is easy to demagnetise, allowing for more control in applications where the magnetic field needs to be switched on and off.
Step 4
Name two other metals that would be attracted to the electromagnet.
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Answer
Cobalt
Nickel
Step 5
Give two ways the force exerted by the electromagnet on a piece of iron or steel could be increased.
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Answer
Increase the current in the coil of the electromagnet.
Bring the electromagnet closer to the pieces of iron and steel.
Step 6
Calculate the magnetic flux density between the magnets.
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Answer
Given:
Length of wire, L=0.120extm
Force, F=0.36extN
Current, I=4.0extA
Using the formula:
B=I⋅LF
Substituting the values:
B=4.0×0.1200.36=0.75extT
The unit of magnetic flux density is Tesla (T).
Step 7
Complete the labels on Figure 7 to show Fleming’s left-hand rule.
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