Permanent and induced magnetism, magnetic forces and fields — WJEC GCSE Physics
In summary: Permanent and induced magnetism, magnetic forces and fields is a key topic in WJEC GCSE Physics. Key exam tip: Always draw magnetic field lines with arrows indicating direction from North to South
Exam Tips for Permanent and induced magnetism, magnetic forces and fields
- Always draw magnetic field lines with arrows indicating direction from North to South
- Ensure you can identify the variables in the F = BIl equation and use consistent SI units
- Practice sketching field patterns for different current-carrying configurations
- Remember that Fleming's left-hand rule requires the thumb, first finger, and second finger to be at right angles to each other
Common Mistakes
- Confusing the direction of magnetic field lines
- Incorrect application of Fleming's left-hand rule
- Failing to identify that the force on a conductor is only at right angles to the magnetic field
- Misunderstanding the difference between permanent and induced magnetism
Marking Points
- Attraction and repulsion between like and unlike poles
- Difference between permanent and induced magnets
- Characteristics of bar magnet magnetic fields (strength and direction)
- Evidence for Earth's magnetic core via compass behavior
- Magnetic field patterns for straight wires, plane coils, and solenoids
- Factors affecting magnetic field strength (current and distance)
- Fleming's left-hand rule application
- Calculation of force on a current-carrying conductor using F = BIl
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