Electricity and Magnetism Exam Review

How can a student pick up more paper clips with their electromagnet made in science class?

• Increase the space between the coils of wire around the nail.

• Increase the voltage that is being sent into the wire.

• Use wire coils that are coated with a conducting material such as plastic.

• Straighten out the coils of wire so that the wire is longer.

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Which is true concerning the magnetic fields between two magnets?

• The South pole of one magnet is attracted to the South pole of another magnet

• The North pole of one magnet is attracted to the North pole of another magnet

• The North pole of one magnet is repelled by the South pole of another magnet

• The North pole of one magnet is attracted the South pole of another magnet.

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Charging by rubbing two different materials together is an example of:

• Conduction

• Induction

• Magnetising

• Friction

What happens if you increase the number of coils around the core of an electric magnet?

• The voltage will increase

• The magnetic field will increase

• The polarity will change

• The electrical current will increase

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In electric field diagrams, how are the stronger areas of the electric field indicated?

• The lines are closer together

• The lines are farther apart

• The lines are longer

• The lines are more of a spiral

What is one way that a permanent magnet is different than an electromagnet?

• Permanent magnets are always weaker

• Permanent magnets eventually wear out

• Electromagnets can be strengthened by decreasing the number of coils

• Permanent magnets can not be turned off

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What happens if a magnet is cut into two halves?

• The north pole is demagnetized

• The south pole and the north pole will switch ends

• The south and north poles are separated permanently

• Two new poles form on the two new magnets

Which of the following statements describes the interaction between magnetic poles?

• Like poles attract each other.

• Like poles repel each other, and opposite poles attract each other.

• Opposite poles repel each other.

• Like poles attract each other, and opposite poles repel each other.

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What would happen if I move a bar magnet in and out of a coil of copper wire?

• Electric current would disappear 
• The magnet would explode 
• Electric current will flow through the wire
• It would produce a gravitational field

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A method to create or generate static electricity in a material by bringing an electrically charged object near it.

• induction
• polarization
• neutralization
• conduction

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