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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 fill... 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
Step 2
Give two reasons for your choice.
Answer
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Magnetisation: Soft iron can be magnetised easily when an electric current passes through the coil around it, enhancing the magnetic field.
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Demagnetisation: When the current is turned off (the switch is open), soft iron quickly loses its magnetism, making it ideal for this demonstration.
Step 3
Step 4
State two changes in the magnetic field measured by the phone from Figure 10 to Figure 11.
Answer
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Direction Change: The direction of the magnetic field has changed from pointing north to approximately northeast (from 0° to 36°).
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Field Strength Increase: The strength of the magnetic field increased 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.
Answer
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Measure Distance: Use a ruler or tape measure to ensure different distances from the magnet are recorded accurately.
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Obtain Measurements: Position the phone at various distances from the magnet and record the strength of the magnetic field displayed on the app at each location.
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Change Conditions: Move the phone or magnet to different positions, ensuring that the field strength is always measured consistently.
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Process Results: Organize the results by drawing a table or graph to compare the strength values at different distances and analyze the trend.