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Describe how a student can determine the shape of the magnetic field around the solenoid. - Edexcel - GCSE Physics - Question 4 - 2016 - Paper 1
Question 4
Describe how a student can determine the shape of the magnetic field around the solenoid.
Worked Solution & Example Answer:Describe how a student can determine the shape of the magnetic field around the solenoid. - Edexcel - GCSE Physics - Question 4 - 2016 - Paper 1
Step 1
Determine the shape of the magnetic field around the solenoid
Answer
To determine the shape of the magnetic field around a solenoid, a student can use a small compass to visualize the field lines. The student should follow these steps:
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Set Up the Solenoid: Connect the solenoid to a direct current power supply and ensure it is secured in a stable position.
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Use a Compass: Take a small compass and place it at one end of the solenoid while ensuring it is not too close to the wires.
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Observe the Direction: Note the direction in which the compass needle points. This direction indicates the magnetic field direction at that point.
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Map the Field Lines: Move the compass gradually around the solenoid, taking readings at different points (both inside and outside the coil). Mark the direction indicated by the compass needle.
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Draw Field Lines: Connect the points where the compass needle was observed to point in the same direction to draw the magnetic field lines. The density of these lines represents the strength of the magnetic field, with closer lines indicating a stronger field.
Step 2
Investigate the magnetic properties of the rods
Answer
The student investigates the magnetic properties of three rods made of soft iron, steel, and wood as follows:
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Insert Each Rod: One by one, the student places each rod inside the solenoid while it is connected to the power supply.
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Activate Power Supply: The student switches on the power supply for a short duration to magnetize each rod temporarily.
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Test Magnetic Strength: After the power is turned off, the student tests how many paper clips each rod can pick up. Soft iron should pick up more clips compared to wood, while steel might retain some magnetism after the current is off.
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Compare Results: The collected data on the number of paper clips held by each rod can then be compared to evaluate their magnetic properties.