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Complete Figure 18 to show the magnetic field pattern around the wire - AQA - GCSE Physics - Question 10 - 2018 - Paper 1
Question 10
Complete Figure 18 to show the magnetic field pattern around the wire. The magnetic flux density 10 cm from the wire is 4 microtesla. Which of the following is the... show full transcript
Worked Solution & Example Answer:Complete Figure 18 to show the magnetic field pattern around the wire - AQA - GCSE Physics - Question 10 - 2018 - Paper 1
Step 1
10.1 Complete Figure 18 to show the magnetic field pattern around the wire.
Answer
To illustrate the magnetic field around the wire, draw at least three concentric circles around the wire. Ensure that the circles have arrows indicating the direction of the magnetic field, which is clockwise when viewed from one end of the wire.
Step 2
Step 3
10.3 When there is a current in the coil, the coil rotates continuously. Explain why.
Answer
The rotation of the coil can be explained by the interaction of the magnetic fields created by the coil and the external magnet.
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Magnetic Field Creation: When a current flows through the coil, it generates its own magnetic field.
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Forces on the Coil: The sides of the coil that are parallel to the magnetic field experience a force in opposite directions, which results in a torque that makes the coil rotate.
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Reversal of Current: During each half-revolution, the commutator reverses the current in the coil, maintaining the direction of rotation.
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Continuous Motion: This continuous flipping ensures that the magnetic forces keep the coil rotating while maintaining the direction of the current in the external magnetic field.