Year 11 - Science
The motor effect
Electromagnetism
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This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.
Unit Summary
This unit explores magnetism, including permanent and induced magnets, magnetic fields, and Earth's magnetism. It covers current-induced magnetic effects, electric motors, and devices like microphones and loudspeakers, with an emphasis on models, calculations, and practical applications.
Lesson Summary
You will learn to describe the force acting on a current–carrying wire or loop in a uniform magnetic field.
Key Notes
- The magnetic field lines around a current-carrying wire are concentric circles
- In a uniform magnetic field, a current carrying wire is forced in one direction
- Fleming's left–hand rule can be used to predict the direction of movement of a current–carrying wire in a magnetic field
- The force on a current–carrying conductor at right angles to a magnetic field, F, is found using F = B I l.
- Opposite sides of a conducting coil in a uniform magnetic field are forced to move in opposite directions
Vocabulary To Learn
- uniform magnetic field: has evenly spaced field lines and the strength of the magnetic field is the same everywhere
- Fleming's left-hand rule: indicates the direction a conducting wire is forced to move in a uniform magnetic field
- magnetic flux density, B: is a measure of the strength of a magnetic field
- tesla (T): is the unit that magnetic flux density is measured in
Common Mistakes To Avoid
- It is not clear how the magnetic field around a conducting wire interacts with a uniform magnetic field.
3 Quick Questions (With Answers)
1. Explain the scientific idea in this lesson using two key points.
The magnetic field lines around a current-carrying wire are concentric circles. In a uniform magnetic field, a current carrying wire is forced in one direction.
2. Define this scientific word and use it in context. 'uniform magnetic field'
has evenly spaced field lines and the strength of the magnetic field is the same everywhere. Include the word in a full scientific explanation, not as a single label.
3. Correct this common scientific misunderstanding.
Mistake: It is not clear how the magnetic field around a conducting wire interacts with a uniform magnetic field. Correction: Focus on observing and predicting the direction that a conducting wire is forced in by a uniform magnetic field, and openly admit that explaining this in terms of how the magnetic field interact is too challenging to include in the syllabus.
More Lessons In This Unit
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