Electromagnetism 1

  Which objects could you combine to build an electromagnet?

• A.  Copper wire, source of electric current, steel screw
• B.  Battery, generator, steel screw
• C. Source of electric current, copper wire, aluminum clip

• D..  Battery, copper wire, plastic straw

A magnetic field is

• something used to demagnetize pieces of metal

• the area in which a magnet exerts magnetic force

• an open area where you are likely to find natural magnets

• an electric charge that can be sent through a wire to make it magnetic

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A wire carries a current, creating ___

• protons and magnetism

• a magnetic field around the wire

• a tension force through the wire

• electrons in the wire

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While electric current is flowing through a wire, what surrounds the wire?

• a magnetic field
• a glowing light
• neutrons
• protons

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Surrounding every magnet is a __________  __________.

• magnetic field
• electrical current
• another magnet
• a current

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Why does a compass change direction when a battery-powered circuit is turned on near it?

• the circuit carries electrons, which attract the positive charged compass

• the circuit carries electrons, which produce a magnetic field

• the circuit carries protons, which produce a magnetic field

• metal wires always have magnetic fields surrounding them

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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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What can you infer from the image shown?

• The current is 0 A

• The wire is carrying a current

• Electrons are leaving the wire to create a magnetic field

• Electricity is flowing through an open circuit, creating a magnetic field

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Ferromagnetic materials have high permeability, meaning ___

• high conductivity to magnetic fields

• they allow some materials to pass through

• they have many pores

• they are resistant to heat

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These magnetic domains are:

• strongly magnetized

• slightly magnetized

• unmagnetized

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