This exam tips covers Exam Tips for Magnetic Fields within Magnetic Fields for GCSE Physics. Revise Magnetic Fields in Magnetism for GCSE Physics with 13 exam-style questions and 12 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 13 of 14 in this topic. Treat this as a marking guide for what examiners are looking for, not just a fact list.
Topic position
Section 13 of 14
Practice
13 questions
Recall
12 flashcards
💡 Exam Tips for Magnetic Fields
🎯 Common Question Types:
- Draw and label field lines for a bar magnet (2 marks)
- Explain how to increase electromagnet strength (3 marks)
- Compare permanent and induced magnets (2-3 marks)
- Explain an application of an electromagnet (2-3 marks)
📝 Key Command Words:
- Draw: Show correct arrows (N to S outside), closer lines at poles, no crossing lines
- Explain: Give a reason — e.g. "iron is used because it loses magnetism when current stops"
- Compare: State similarities AND differences between permanent/induced
- Describe: Give the direction and pattern of the field
⚠️ Common Mistakes to Avoid:
- Drawing field lines going from S to N — always N to S outside the magnet
- Forgetting arrows on field lines
- Saying "steel core" instead of "soft iron core" for electromagnets
- Saying induced magnets can be repelled — they ALWAYS attract to permanent magnets
Quick Check: List three ways to increase the strength of an electromagnet and explain why a soft iron core is better than a steel core.
Three ways: (1) increase the current, (2) increase the number of turns/coils, (3) add a soft iron core. Soft iron is better than steel because it is an induced magnet — it becomes strongly magnetised when current flows but immediately loses its magnetism when the current is switched off. Steel would stay magnetised permanently, making it impossible to switch the electromagnet off.