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.
Figure 4
Where is the magnetic field of the magnet the strongest?
How does Figure 4 show ... 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 indicates that the strength of the magnetic field is not uniform; the distance between the field lines illustrates that the field is stronger where the lines are closer together.
Step 3
Explain one reason why an electromagnet is used instead of a permanent magnet.
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Answer
An electromagnet is preferred because it can be easily switched on and off, allowing for control over whether metal is attracted.
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. Give the unit.
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Answer
Given the force (
F = 0.36 ext{ N}
), current (
I = 4.0 ext{ A}
), and length of wire (
L = 0.120 ext{ m}
), we can use the formula:
B=I⋅LF
Substituting gives:
B=4.0×0.1200.36
Calculating results in:
B=0.75extT
Hence, the magnetic flux density is 0.75 T.
Step 7
Complete the labels on Figure 7 to show Fleming's left-hand rule.
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Answer
Direction of magnetic field: from North to South
Direction of current: direction of current in the wire
Direction of force: direction in which the wire moves
