Magnetism and Electromagnetism

Flashcards covering key concepts in magnetism and electromagnetism.

Magnetic poles

Like poles repel each other (North-North, South-South) while opposite poles attract.

Permanent Magnets

Magnets that are always magnetic and have fixed poles, used in speakers, compasses, and electric generators.

Induced Magnets

Materials that can become magnetic but do not have fixed poles; magnetism must be induced by another magnet.

Electromagnets

Temporary magnets that use a magnetic material in their core, losing magnetism when the current stops or the material is knocked.

Magnetic Field

The area around a magnet where magnetic forces can be felt, with field lines pointing from North to South.

Strength of Magnetic Field

Depends on the amount of current and decreases with distance from the current-carrying conductor.

Solenoid

A coil of wire that produces a uniform magnetic field when current flows through it, especially if it has an iron core.

Fleming's Left Hand Rule

A method to determine the direction of force, current, and magnetic field in an electromagnetic system.

Motor

A device consisting of a coil of wire situated between two permanent magnets; when current flows, it causes the coil to rotate.

Current

The flow of electric charge that produces a magnetic field around a conductor.