Electromagnetism

1) What happens to the strength of a magnetic field as you move away from the magnet?

• The strength of the magnetic field increases.

• The strength of the magnetic field doesn't change.

• The strength of the magnetic field is doubled.

• The strength of the magnetic field decreases.

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2) How do you make an electromagnet stronger?

• Add a motor and/or lightbulbs

• Add more light bulbs and/or wire coils

• add more wire coils and/or a switch

• add more wire coils and/or batteries

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3) This is a picture of a simple electromagnet. How can the electromagnet be made stronger?

• Add more coils of wire to the nail.

• Use a smaller battery.

• Reverse the poles of the magnet.

• Remove all the coils and the nail.

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4) What happens when an electric current flows through a wire?

• The wire begins to spin.

• Nothing happens.

• A field of gravity is created around the wire.

• A magnetic field is created around the wire.

5) Increasing the number of coils in an electromagnet will _________ the power of the magnet.

• decrease

• increase

• not affect

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NGSS.MS-PS2-3

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6) What type of core is best for electromagnets?

• Steel

• Iron

• Plastic

• Copper

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7) As the strength of a magnetic field increases, the ability to attract metal objects ____________.

• increases

• decreases

• stays the same

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8) The picture above is an example of what?

• Magnetic field

• Electric field

• Repulsion

• Attraction

9) A current is produced when _______________ flow in a circuit.

• protons

• neutrons

• electrons

• nucleons

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10) What is/are the difference(s) between a magnet and an electromagnet?

• An electromagnet can be turned on/off.

• A magnet can be turned off.

• An electromagnet is stronger.