Magnetic Fields Review Guide

magnetism

Magnetic field

A magnetic field is an invisible area of force around a magnet that can push or pull other magnetic materials like iron.

Magnetic Field Lines

All magnets are dipolar. They have a north and south magnetic pole. Pole creating a loop.

The force of attraction exits what poles and enters through what pole creating a loop.

North to South

Attract

To draw by a physical force causing or tending to cause to approach, adhere, or unite; pull.

Repel

To push back or away by a force, as one body acting upon another; push.

Temporary magnet

Has coils of current carrying wire around a metal core.

Electromagnet

A temporary magnet that runs on electricity.

Magnet

A body, as a piece of iron or steel, that possesses the property of attracting certain substances, as iron.

Iron filings

Tiny pieces of iron used to visualize invisible magnetic fields.

Magnetism

A physical phenomenon produced by the motion of electric charge, resulting in attractive and repulsive forces between objects.

Compass

An instrument for determining directions, as by means of a freely rotating magnetized needle that indicates magnetic north.

Dipolar

They have a north and south magnetic pole.(having two poles)

Non contact force

The push or pull exerted by magnets or moving electric charges on other magnetic materials or moving charges, without physically touching them, acting through an invisible magnetic field.

Magnetosphere

The outer region of the earth's ionosphere, where the earth's magnetic field controls the motion of charged particles, as in the Van Allen belts.

Earth’s poles

Two points where the planet's magnetic field is strongest and vertical.

Does the compass points to the actual north pole on geological map.

No, it is the opposite(north pole on earth is south on compass)

Electric Current

The time rate of flow of electric charge, in the direction that a positive moving charge would take and having magnitude equal to the quantity of charge per unit time: measured in amperes.

Ferromagnetic material

a substance, like iron, nickel, or cobalt, that strongly attracts magnets and can become a strong, permanent magnet itself by aligning its internal magnetic domains, even without an external field.