Magnetism Worksheet Grade 8 Pdf - Fill Online, Printable, Fillable ... - Free Printable

Final Answer:
A. Magnetism—the properties and behaviors of magnets
1. Interaction between two magnets, called magnetic force, increases as magnets move closer together.
2. A magnetic field, which exerts the magnetic force, surrounds a magnet, and is strongest closest to the magnet.

B. Magnetic poles—the regions of a magnet where the magnetic force exerted by the magnet is strongest
1. All magnets have a north pole and a south pole.
2. Like poles repel. Unlike poles attract.
3. Earth has magnetic poles.
 a. A compass needle is a small bar magnet that can freely rotate.
 b. A compass needle always points north.

C. Magnetic materials—iron, cobalt, and nickel
1. The magnetic field created by each atom exerts a force on nearby atoms.
2. Magnetic domains—groups of atoms with aligned magnetic poles
 a. In a magnet, the like poles of all the domains point in the same direction.
 b. Permanent magnets are made by placing a magnetic material in a strong magnetic field, forcing a large number of magnetic domains to line up.

Section 2 A. Moving charges, like those in an electric current, produce magnetic fields.
 a. The magnetic field around a current-carrying wire forms a circular pattern about the wire.
 b. The direction of the field depends on the direction of the current.
 c. The strength of the magnetic field depends on the amount of current flowing in the wire.