U2:L2 - Magnets and Magnetic Force

1. Which of the materials below can be attracted by a magnet? Check ALL that apply.

• Iron

• Gold

• Copper

• Nickel

• Cobalt

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2. We know the substance in the image is magnetized because...

• all the domains are at right angles to each other.

• the domains are aligned.

• the arrows are drawn in red.

• the domains are not aligned.

3. How will these two magnets interact?

• they will repel each other.

• they will attract each other.

• they will exert no force on each other.

• They will both turn to the right.

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5. The permanent bar magnet and solenoid pictured are equal in strength. How could the force between the two magnets be increased? Select ALL that apply.

• The magnets could be moved closer together.

• The current in the solenoid could be decreased.

• The permanent magnet could be turned around.

• The number of loops in the solenoid could be increased.

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6, Bob made an electromagnet but it was very weak. How can he make it stronger?

• use fewer loops of wire

• wrap the wire loosely

• add more loops of wire to the electromagnet

• take away one of the batteries.

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7. Which is NOT a property of a magnet?

• All magnets have two poles.

• All magnets have a force of attraction or repulsion.

• All magnets are surrounded by a magnetic field.

• All magnets can be turned on and off.

8. This large crane magnet functions only when the electrical current is ON. The crane magnet is an example of what type of magnet?

• Horseshoe Magnet

• Electromagnet

• Ceramic Magnet

• Bar magnet

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9. If you cut a bar magnet in half you end up with...

• a magnet with only a north pole.

• a magnet with only a south pole

• two smaller magnets with both north and south poles.

• a material that has no magnetism.

10. Electric current is ...

• always positive.

• the continuous flow of electrical charges.

• a build up of electrical charge.

• the flow of protons.

11. When an electric current runs through a wire, a magnetic field is created ...

• around the wire.

• parallel to the wire.

• under the wire.

• through the wire.

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