How Magnets Work

What kind of magnet is this?

• Round

• Horseshoe

• Bar

• Ring

What kind of magnet is this?

• Bar

• Horseshoe

• Ring

• A north magnet

What kind of magnet is this?

• Bar

• Rectangle

• Horseshoe

• Ring

What happens when 2 north poles of magnets are facing each other?

• It splits in half

• Nothing

• They repel

• They attract

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Why will a compass point toward a bar magnet a few inches away instead of to Earth's north magnetic pole?

• Earth is a giant magnet, but the magnet is closer.

• The compass's needle only works when it is outside.

• The magnet made Earth's magnetic field change direction.

• Earth is bigger than the magnet so it has more gravity.

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An Electromagnet is different from a permanent magnet. In order for an electromagnet to work, what must be true?

• It has to be touching another magnet.

• It must be heated until it is almost melting.

• It must have a complete electrical circuit.

• It must be lined up with Earth's magnetic field.

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What is true of magnetic substances?

• They can move iron objects without touching them.

• They can give a shock when you touch them.

• They fall faster when you drop them.

• They are always black and cold to touch.

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In the picture of the magnets, what do you predict will happen?

• Set A will attract and Set B will repel.

• Set A will repel and Set B will attract.

• They will both attract.

• They will both repel

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A complete electrical circuit made of wire coiled around an iron rod, a battery, and a switch are components of which of the following?

• A permanent magnet

• A natural magnet

• A magnetized paper clip

• An electromagnet

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Keisha made an electromagnet in class. She wound a wire over and over around a paper tube. Then she connected the ends of the wire to a battery. She tested the electromagnet, and it attracted some paper clips.

She is wondering if it really made the electromagnet stronger if the wire was wound more times around the tube. What is the best way to find out?

• Try lifting more paper clips and iron filings.

• Try winding the wire 20, 30, 40, then 50 times.

• Try adding 2, 3, 4, then 5 batteries.

• Try changing to a different kind of wire.

Tags

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