4 (a) A teacher prepares some equipment to demonstrate electromagnetism - Edexcel - GCSE Physics - Question 4 - 2022 - Paper 1
Question 4
4 (a) A teacher prepares some equipment to demonstrate electromagnetism. Figure 9 shows the equipment.
The teacher wants to show that iron fillings
are picked up by... show full transcript
Worked Solution & Example Answer:4 (a) A teacher prepares some equipment to demonstrate electromagnetism - Edexcel - GCSE Physics - Question 4 - 2022 - Paper 1
Step 1
Suggest a suitable metal for the rod.
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Answer
A suitable metal for the rod is soft iron. Soft iron is preferred because it is easily magnetized and demagnetized, making it ideal for demonstrating the principles of electromagnetism.
Step 2
Give two reasons for your choice.
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Answer
Soft iron can be easily magnetized when the electric current is flowing through the coil, which allows the iron fillings to be picked up.
It can also be demagnetized quickly when the switch is opened, ensuring the iron fillings fall off.
Step 3
State why the strength of the magnetic field shown is not zero.
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Answer
The strength of the magnetic field is not zero because the Earth has its own magnetic field. The phone can still detect this magnetic field even when there are no nearby magnets.
Step 4
State two changes in the magnetic field measured by the phone from Figure 10 to Figure 11.
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Answer
The direction of the magnetic field has changed from pointing to the north (0°) to pointing northeast (36°).
The strength of the magnetic field has increased, changing from 46.67 µT to 63.19 µT.
Step 5
Describe how the student could use the mobile phone to investigate the strength of the magnetic field at different distances from the magnet.
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Answer
The student could follow these steps to investigate the strength of the magnetic field at different distances:
Use a ruler or tape measure to measure the distance from the phone to the magnet.
Obtain a measurement of the magnetic field strength at that specific distance.
Change the conditions by moving the phone or magnet to different locations to investigate various distances.
Rotate the phone to ensure consistent positioning while measuring.
Process the results by drawing a diagram, making a table, and comparing the measurements at different distances.
