Magnetism

Magnetism

By Barbara Isidoro

Ø study of magnetic fields and their effect on material

Ø different from electricity

Ø electromagnetism- explains how electric current create magnetic field and vice versa (electromagnetic induction)

Ø force like gravity and he strong and weak forces inside the nucleus of an atom

Magnetism

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Multiple Choice

What are the objects that are attracted to magnet?

• objects made of iron and steel

• objects made of plastic

• objects made of glass

Magnets

• diamagnetic -  substances that are slightly repelled by magnets are. Table salt, mercury, zinc and gold are diamagnetic substances.

• paramagnetic - substances, such as wood, aluminum, platinum and oxygen, are just slightly attracted by strong magnets

• ferromagnetic- strongly magnetic materials that contains Fe, Ni and Co

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Multiple Choice

How many poles do magnets have?

• 1

• 2

• 3

• Magnetic Poles- the force of attraction produced by the ends of the magnet

• The blue end of a magnet is usually the south pole (S).

• The red end of a magnet is usually the north pole (N).

• The attraction is strongest at the poles and weakest at the center.

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Magnetic Poles

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Multiple Choice

Magnets have the ability to attract materials that are magnetic in nature.

• TRUE

• FALSE

Multiple Choice

Like poles attract and unlike poles repel each other.

• TRUE

• FALSE

Multiple Choice

When allowed to hang freely, magnets always align in one particular direction.

• TRUE

• FALSE

Multiple Choice

Magnetic poles always occur in pairs.

• TRUE

• FALSE

Multiple Choice

The strength of the force between magnets depends on the distance between them. The magnetic force increases with distance much faster than does either gravity or the electric force.

• TRUE

• FALSE