Figure 5 shows a bar magnet - AQA - GCSE Physics - Question 3 - 2019 - Paper 1
Question 3
Figure 5 shows a bar magnet.
Each circle represents a compass.
Draw an arrow inside each circle to show the direction that each compass would point.
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Figure 6... show full transcript
Worked Solution & Example Answer:Figure 5 shows a bar magnet - AQA - GCSE Physics - Question 3 - 2019 - Paper 1
Step 1
Draw an arrow inside each circle to show the direction that each compass would point.
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Answer
Both arrows should be drawn pointing horizontally to the right, indicating the direction of the magnetic field lines.
Step 2
Explain why the magnets inside the coat must not have two south poles facing each other.
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Answer
The two south poles would repel each other, preventing the coat from fastening properly. This repulsion would cause the magnets to push away from each other instead of holding the coat closed.
Step 3
Which type of rod would make the magnetic field of the coil stronger? Tick (✓) one box.
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Answer
Steel rod: The steel rod should be ticked, as it is ferromagnetic and would enhance the magnetic field when placed inside the coil.
Step 4
Determine the increase in the extension of the spring.
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Answer
The increase in the extension of the spring is 1.5 cm.
Step 5
Calculate the increase in the force on the spring when the current in the coil increased from 0.6 A to 1.2 A.
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Answer
Using the formula:
extForce=extSpringConstantimesextExtension
The increase in the force is calculated as follows:
F=0.18extN/cmimes1.5extcm=0.27extN.
Alternatively, it is also calculated as:
F=0.18extN/cmimes3.6extcm=0.27extN.
Step 6
Describe what happened to the strength of the electromagnet as the current in the coil increased from 1.2 A to 1.6 A.
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Answer
As the current increased, the strength of the electromagnet also increased, reaching a maximum point. Beyond this point, it may not change significantly with further increases in current.
