Core5 mapped NDA questions
Build the idea
Build exam-ready understanding by connecting the core idea, formulas or facts, worked example and previous NDA questions. Focus on why each rule works, then test it under timed conditions.
Concept
A magnet has two poles and produces a magnetic field. Like poles repel and unlike poles attract. The Earth itself behaves like a giant magnet, which is why a compass needle points north–south.
Magnets can be natural or artificial (electromagnets).
Key Points & Formulas
- Like poles repel; unlike poles attract.
- A freely suspended magnet aligns north–south.
- An electromagnet is made by passing current through a coil.
- Magnetic materials: iron, cobalt, nickel.
Worked Example
Q. Why does a freely suspended bar magnet always come to rest in a particular direction?
The Earth behaves as a magnet with poles near the geographic poles.
The bar magnet aligns with the Earth's magnetic field.
So it rests in the north–south direction.