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.
metal rod
battery
coil of insulated wire
switch
iron fili... 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
(a)(i) 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 easily becomes magnetized when an electric current flows through the coil of insulated wire.
Step 2
(a)(ii) Give two reasons for your choice.
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Answer
Soft iron will be magnetized when the switch is closed, allowing it to effectively pick up the iron filings.
It will be demagnetized when the switch is open, ensuring that the iron filings fall off when the current is stopped.
Step 3
(b)(i) 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 a magnetic field/core, which affects the readings on the mobile phone's magnetic field app.
Step 4
(b)(ii) 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 changed from N to NE as the phone was rotated.
The strength of the magnetic field increased, changing from 46.67 µT to 63.19 µT.
Step 5
(b)(iii) 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 investigate the strength of the magnetic field by following these steps:
Use a ruler or tape measure to measure the distance between the phone and the magnet.
Obtain a measurement of the magnetic field strength at that distance using the app.
Move the phone or the magnet to different locations and repeat the measurement process, ensuring to keep other conditions constant (e.g., the field stays unchanged).
Process the results by drawing a diagram, making a table, or comparing results to assess how distance affects the magnetic field strength.
