Figure 16 shows the magnetic field pattern around a bar magnet - AQA - GCSE Physics - Question 7 - 2021 - Paper 1
Question 7
Figure 16 shows the magnetic field pattern around a bar magnet.
Draw an arrow at point A and point B to show the direction of the magnetic field at each point.
A b... show full transcript
Worked Solution & Example Answer:Figure 16 shows the magnetic field pattern around a bar magnet - AQA - GCSE Physics - Question 7 - 2021 - Paper 1
Step 1
Draw an arrow at point A and point B to show the direction of the magnetic field at each point.
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Answer
At point A, the arrow should point away from the bar magnet towards the north direction, indicating that magnetic field lines radiate outward. At point B, the arrow should point towards the bar magnet from the south, indicating that magnetic field lines are attracted towards the magnet.
Step 2
A bar magnet is an example of ____________.
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Answer
A bar magnet is an example of a permanent magnet.
Step 3
Which graph shows how the strength of the magnetic field varies with distance from the bar magnet?
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Answer
The third graph should be ticked as it shows that the strength of the magnetic field decreases with an increase in distance from the bar magnet.
Step 4
Explain how the electromagnet and conveyor belt are used to separate the steel cans from the aluminium cans.
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Answer
The electromagnet attracts steel cans while the conveyor belt transports both the steel and aluminium cans. As the cans move on the conveyor belt, steel cans are pulled towards the electromagnet and transferred into the container, while aluminium cans, which are not attracted to the electromagnet, remain on the conveyor belt and are left behind on the table.
Step 5
Describe two ways to increase the strength of the magnetic field at the top of the table.
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Answer
Raise the height of the table to allow for a more direct magnetic field.
Use a larger potential difference or increase the current used by the electromagnet.
Step 6
Write down the equation which links distance travelled (s), speed (v) and time (t).
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Answer
The equation is: distance travelled (s) = speed (v) × time (t) or s = vt.
Step 7
Calculate the time taken to move the can 3.3 m at this speed.
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Answer
To find the time, use the equation: t=vs. Substituting the values, we have:
t=1.7 m/s3.3 m≈1.941 s.
Rounded to 2 significant figures, the time taken is 1.9 s.
