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The diagram shows a small rectangular coil falling between two magnetic poles - AQA - A-Level Physics - Question 24 - 2020 - Paper 2
Question 24
The diagram shows a small rectangular coil falling between two magnetic poles. The coil is shown at four instants as it passes through the magnetic field. At which ... show full transcript
Worked Solution & Example Answer:The diagram shows a small rectangular coil falling between two magnetic poles - AQA - A-Level Physics - Question 24 - 2020 - Paper 2
Step 1
At which instant will the induced emf be a maximum?
Answer
To determine when the induced emf in the coil is at a maximum, we need to consider Faraday's law of electromagnetic induction. This law states that the induced emf is directly related to the rate of change of magnetic flux through the coil.
As the coil moves through the magnetic field, it will experience a change in magnetic flux. The change in flux is maximized when the coil is perpendicular to the magnetic field lines. In the given options:
- A: The coil is in a parallel position.
- B: The coil is perpendicular to the field, experiencing maximum change.
- C: The coil is parallel again.
- D: The coil remains perpendicular, still experiencing change.
Thus, the induced emf will be maximum when the coil is positioned perpendicular to the magnetic field, which occurs at option B.