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A teacher is demonstrating electromagnetic induction - Edexcel - GCSE Physics - Question 6 - 2019 - Paper 1
Question 6
A teacher is demonstrating electromagnetic induction. The teacher has a bar magnet, a coil of wire and a sensitive voltmeter. (i) Draw a diagram to show how the tea... show full transcript
Worked Solution & Example Answer:A teacher is demonstrating electromagnetic induction - Edexcel - GCSE Physics - Question 6 - 2019 - Paper 1
Step 1
Draw a diagram to show how the teacher should arrange the apparatus.
Answer
To illustrate the arrangement of the apparatus:
- Components: Start by drawing the bar magnet on the left side, ensuring its poles are labeled (N and S).
- Coil of Wire: Position the coil of wire horizontally next to the magnet, with its plane perpendicular to the magnetic field lines from the magnet.
- Voltmeter Connection: Connect the voltmeter's terminals across the ends of the coil. The voltmeter should not be labeled but emphasize its importance in measuring the induced potential difference.
Step 2
Explain how the teacher could use this apparatus to demonstrate the factors affecting the size and direction of the induced potential difference.
Answer
The teacher can demonstrate electromagnetic induction using the following methods:
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Move Magnet Towards Coil: By moving the magnet towards the coil, an induced potential difference is generated, which can be observed on the voltmeter. The direction of the induced current can be noted based on the relative motion.
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Change Poles of Magnet: Reversing the poles of the magnet will show a change in the direction of the induced current, thereby illustrating how the direction of the magnetic field influences the induced potential difference.
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Change Speed of Movement: The teacher can vary the speed at which the magnet is moved toward or away from the coil. A quicker movement will result in a larger induced potential difference, as indicated by a higher reading on the voltmeter.
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Number of Turns in the Coil: Lastly, the teacher can demonstrate that increasing the number of turns in the coil will also increase the induced potential difference measured by the voltmeter. This is due to the greater amount of magnetic flux linkage with more turns.