Test: Magnets - Year 8 MCQ

When two north poles are brought near each other, they repel due to the property of magnets where like poles repel and opposite poles attract, as stated in the properties of magnets.

Steel, iron, and nickel are metals that are attracted to a magnet and are considered ferromagnetic. Ferromagnetic materials have strong interactions with magnetic fields, causing them to be attracted to magnets. Copper and gold, on the other hand, are not attracted to magnets and are classified as non-magnetic materials in this context.

A magnetized piece of steel is used in a compass as the needle, which aligns with the Earth's magnetic field to point toward the magnetic north pole.

The other materials are not affected by a magnetic field.

Copper objects will therefore not be attracted to a magnet.

Magnets create a magnetic field around them, which is the region where magnetic forces are exerted. This magnetic field interacts with objects containing iron or steel, causing them to be attracted to the magnet.

It lines up with the magnetic field of the Earth.

Permanent magnets retain their magnetism after being removed from a magnetic field, as they are made from ferromagnetic materials like steel or neodymium alloys that maintain aligned magnetic domains.

Magnetic force is strongest at the poles.

Exposing a magnet to a strong magnetic field in the opposite direction demagnetizes it by disrupting the alignment of its magnetic domains. Other methods, such as heating to a high temperature or repeated hammering, can also demagnetize a magnet but are less precise or context-specific.