Magnetism and electromagnetism — WJEC GCSE Physics
In summary: Magnetism and electromagnetism is a key topic in WJEC GCSE Physics. Key exam tip: Always draw field lines with arrows indicating direction from North to South
Exam Tips for Magnetism and electromagnetism
- Always draw field lines with arrows indicating direction from North to South
- Ensure units are consistent when using the F = BIl equation
- Remember that transformers change voltage but assume 100% efficiency unless stated otherwise for power calculations
- Use clear, concise terminology when describing electromagnetic induction
Common Mistakes
- Confusing the direction of magnetic field lines with the direction of current
- Incorrectly applying Fleming's left-hand rule
- Failing to identify that transformers only work with alternating current
- Misinterpreting the relationship between turns ratio and voltage ratio
Marking Points
- Distinction between permanent and induced magnets
- Characteristics of magnetic fields around bar magnets and current-carrying conductors
- Application of Fleming's left-hand rule for the motor effect
- Calculation of force on a current-carrying conductor using F = BIl
- Explanation of electromagnetic induction and factors affecting induced potential
- Operation of transformers using the turns ratio and power equations
- Role of transformers in efficient power transmission
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