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- 1. Multiple Choice
Which best describes what will happen if you touch a permanent magnet to iron?
The iron ALWAYS becomes magnetic.
The iron RARELY becomes magnetic.
The iron SOMETIMES becomes magnetic.
The iron NEVER becomes magnetic.
- 2. Multiple Choice
What occurs if the electrical current is turned off to an electromagnet?
The iron core slowly looses the magnetism that it has built up.
The magnetism is turned off.
The current continues to flow because of the magnetic force.
The electromagnet reverses its polarity.
- 3. Multiple Choice
Which best describes the ability to create electricity with a magnet?
It cannot be created with a magnet because only friction on electric charges or batteries creates electricity.
It cannot be created with a magnet because electricity is only created at large power plants using huge turbines.
It can be created by rotating a coil of wire between two
It can be created by putting a current through a wire around a magnet.
- 4. Multiple Choice
Which best describes how to make an electromagnet?
Line up the N and S poles of a magnet with an electric wire.
Wrap a magnet around a piece of wire with a current flowing through it
Run current through a wire wrapped around an iron rod.
Wrap a piece of wire around an iron rod looping the wire over 20 times.
- 5. Multiple Choice
Which of the following does not describe a solenoid?
It consists of a long straight coil of wire.
They can be used to generate a magnetic field similar to that of a bar magnet.
They have many practical applications
The magnetic field of a solenoid is decreased by adding an iron core.
- 6. Multiple Choice
What does a magnet attract?
Anything made of metal.
Aluminum foil
Iron, steel, nickel and other magnets.
Some types of plastics.
- 7. Multiple Choice
What happens to the magnetic force as the distance between two magnetic poles increases?
It remains constant
It decreases
It increases
It alternates between increasing and decreasing.
- 8. Multiple Choice
In a generator, the current is produced when the mechanical energy of the motor is transferred to what type of energy?
electrical
magnetic
chemical
nuclear
- 9. Multiple Choice
What is the process of producing an electrical current by moving a magnet in and out of a coil of wire?
magnetic deduction
electromagnetic induction
magnetic reduction
magnetic production
- 10. Multiple Choice
What can cause a magnet to lose its magnetism?
leaving it outsider in the hot.
leaving it outside in the cold.
remagnetizing it.
dropping it.
- 11. Multiple Choice
An electric motor uses an electromagnet to make what change?
mechanical energy to electrical energy
electrical energy to mechanical energy
magnetic fields in the motor
magnetic poles in the motor.
- 12. Multiple Choice
Which will increase the strength of an electromagnet?
plastic core
less coils
weaker electricity
more coils
- 13. Multiple Choice
On which part of a magnet are the magnetic field and forces the strongest?
magnetic field
magnetic repulsion
magnetic pole
magnetic attraction
- 14. Multiple Choice
What will be made if a bar magnet is cut in half?
two smaller magnets, each with a north and south pole
one magnet with a north pole only and one magnet with a south pole only.
two unmagnetized bars
two magnets with a north pole only.
- 15. Multiple Choice
What would cause the poles of two magnets to repel each other?
both poles must be south poles
both poles must be north poles
one pole is a south pole and the other is a north pole
the poles are the same.
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