Magnetism and Electromagnetism Review

When is an object magnetic?

• when it only has a north pole

• when it only has a south pole

• when it is free to rotate

• when it attracts iron

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Chris rubs an iron nail in one direction with the south pole of a magnet. Which of the following is TRUE of the magnetized nail?

• it will only be attracted to the north pole of a magnet

• it has a strong north pole and a much weaker south pole

• its domains have become rearranged so that they are lined up in one direction

• the bar magnet has caused a random arrangement of the nail's domains

Magnetic field lines show that the force between a south pole and a north pole

• have no effect on the poles

• cause the poles to move away from each other

• cause the poles to move toward each other

• destroy the alignment of the domains in the magnet

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Which of the following would NOT cause a magnet to lose its magnetism?

• hitting it too hard

• placing it in the field of a stronger magnet

• freezing it

• heating it

Label the parts of the electromagnet.

a

b

c

d

iron core

wire

solenoid

voltage source

Which of these is a way to make an electromagnet stronger?​ ​ ​ ​ (a)  

• wrapping the wire around the iron core more

• putting a switch in the electrical circuit

• replacing the copper wire with plastic wire

• replacing the iron core with a copper core

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As electrons move in a current, they make

• a broken circuit

• a magnetic field

• a gravitational force

• a bar magnet

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

• magnetic pole

• electromagnet

• permanent magnet

• horseshoe magnet

Which of the following actions will decrease the strength of the magnetic field of an electromagnet?

• adding fewer loops of wire per meter in the coil

• decreasing the current in the wire

• removing the wire

• all of the above

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Which of the following solenoids has the strongest magnetic fields?

• a solenoid without an iron core and 2 amps of current

• a solenoid with an iron core and 2 amps of current

• a solenoid with an iron core and 4 amps of current

• a solenoid without an iron core and 4 amps of current

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