Magnetism Worksheet

A magnet is an object that produces a magnetic field. What does it do?

• It produces sound waves

• It produces a magnetic field

• It produces light

• It produces heat

The difference between permanent magnets and temporary magnets is:

• Permanent magnets retain their magnetism for a long time, while temporary magnets lose their magnetism quickly.

• Permanent magnets are made of plastic, while temporary magnets are made of metal.

• Temporary magnets are always stronger than permanent magnets.

• Permanent magnets can only be used once.

What are the two poles of a magnet, and how do they interact with each other?

• The two poles of a magnet are North and South; like poles repel and unlike poles attract.

• The two poles of a magnet are East and West; like poles attract and unlike poles repel.

• The two poles of a magnet are Top and Bottom; all poles attract each other.

• The two poles of a magnet are North and South; all poles repel each other.

The significance of magnetic field lines is:

• They show the direction and strength of the magnetic field.

• They represent electric current flow.

• They indicate gravitational force.

• They show the direction of heat flow.

5. The strength of the magnetic force between two magnets decreases as the distance between them:

• increases

• decreases

• remains the same

• fluctuates

An electromagnet is created by:

• Wrapping a coil of wire around an iron core and passing an electric current through it.

• Placing a magnet near a piece of iron.

• Heating a piece of iron until it becomes magnetic.

• Rubbing a piece of iron with a magnet repeatedly.

7. What materials are considered ferromagnetic, and why?

• Materials like iron, cobalt, and nickel are considered ferromagnetic because they have unpaired electrons that align to produce strong magnetic fields.

• Materials like copper and aluminum are considered ferromagnetic because they conduct electricity well.

• Materials like gold and silver are considered ferromagnetic because they are dense metals.

• Materials like plastic and wood are considered ferromagnetic because they are insulators.

How do magnets interact with non-magnetic materials?

What is the role of magnetic domains in ferromagnetic materials?

Give two applications of magnets in modern technology.

• Electric motors – Magnets are used to create motion in machines. Magnetic storage devices – Hard drives use magnets to store data.

• Magnets are used in cooking food and cleaning water. Magnets are used to make paper and plastic.

• Magnets are used in growing plants and making medicines. Magnets are used to produce sunlight indoors.

• Magnets are used in painting walls and building roads. Magnets are used to cool rooms and heat water話をききます。