Magnetism & ElectromagnetismOxford AQA IGCSE Physics: Flashcards

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What happens when two like magnetic poles are brought together? And two unlike poles?

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What happens when two like magnetic poles are brought together? And two unlike poles?: Like poles repel; unlike poles attract.
Define a magnetic field.: The region around a magnet (or current-carrying wire) where a force acts on a magnetic material.
Name three magnetic materials.: Any three of: iron, steel, cobalt, nickel.
What is a uniform magnetic field?: A field where the field lines are parallel and evenly spaced, so the field strength is the same everywhere.
What is induced magnetism?: Magnetism gained by a magnetic material when it is placed in a magnetic field, causing attraction towards the inducing magnet.
What happens to induced magnetism when the material is removed from the field?: The material loses most or all of its induced magnetism.
How does a plotting compass work?: It contains a small pivoted magnet that aligns with the Earth's magnetic field, pointing towards magnetic north.
Describe the magnetic field around a straight current-carrying wire.: Concentric circles perpendicular to the wire, stronger closer to the wire.
What happens to the field around a wire if the current is increased?: The magnetic field becomes stronger.
What happens to the field direction if the current in a wire is reversed?: The direction of the magnetic field reverses.
What is a solenoid?: A coil of wire that produces a strong magnetic field, similar in pattern to a bar magnet, when current flows through it.
How is an electromagnet made from a solenoid?: By adding an iron core inside the solenoid, which concentrates and strengthens the magnetic field.
Give one advantage of an electromagnet over a permanent magnet.: It can be switched on and off, and its strength can be varied by changing the current or number of turns.