Electricity and Magnetism 3

The magnetic field of an electromagnet can be increased by 

• changing the direction of the current.
• decreasing the current.
• increasing the number of coils. 
• decreasing the number of coils. 

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What does this illustration represent? 

• magnetic material that is not magnetized
• magnetic material that is magnetized
• non-magnetic material
• arrangements of atoms in a domain

In this illustration, the magnetic field is strongest ___. 

• near either pole
• near the north pole
• near the south pole
• halfway between the poles

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What effect does increasing the current flowing in the wire have on an electromagnet?

• It decreases the strength of the magnetic field. 
• It increases the strength of the magnetic field. 
• It has no effect on the electromagnet. 
• It causes it to become a permanent magnet. 

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You observe that magnets A and B are attracted to each other and "stick." Which sentence BEST explains this observation? 

• Both are positively charged. 
• Both are tightly bonded to each other. 
• Both are composed of smaller, individual magnets. 
• Both have all their magnetic domains aligned in the same direction. 

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As electrons flow through the metal wire in the center of this motor, the metal begins to turn. This is because

• electric charges act as tiny magnets. 
• a flow of electrons experiences a force in a magnetic field. 
• positive electric charges are attracted to the south pole of a magnet. 
• positive electric charges are attracted to the north pole of a magnet. 

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Objects that keep their magnetic properties for a long time are called ___. 

• electromagnets
• magnetic domains
• permanent magnets
• temporary magnets

A coil of wire with a current is called a(n)

• insulator.
• solenoid. 
• electromagnet.
• galvanometer.

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The function of an electric motor is to change ___. 

• chemical energy to electrical energy
• electrical energy to chemical energy
• electrical energy to mechanical energy
• mechanical energy to electrical energy

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A coil of wire that has a soft iron core and that acts as a magnet when an electric current is in the coil called a(n) 

• ferromagnet.
• electromagnet. 
• permanent magnet.
• temporary magnet.

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