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Electromagnet Activity – Assessment
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Name:_____________________________________Date________________________Per_____
Choose the best answer.
1. Which is the best explanation of magnetic force?
a. Magnetism is a metal’s gravity
b. Magnetism is the attraction between like particles.
c. Magnetism is the force exerted by an electric
current.
d. Magnetism is none of the above.
3. The lights of the Aurora Borealis result from
a. particles from the Sun hitting Earth’s
magnetosphere.
b. static electricity in the troposphere.
c. lightning storms taking place over the horizon.
d. rainbows that occur at night.
5. The Earth's magnetic North Pole changes location
over time. What causes this?
a. changes deep in the Earth's core
b. the rotation of the Earth
c. the Moon revolving around the Earth
d. the Earth revolving around the Sun
2. A bar magnet has two poles -- a north pole and a
south pole. If the bar was cut in half
a. each half would be either north or south.
b. each half would have its own north pole and south
pole.
c. each half couldn’t be attracted to the other half.
d. each half would lose its magnetism.
4. Which of these would increase the force of an
electromagnet?
a. increasing the current being passed through the coil
b. reversing the flow of electricity through the coil
c. decreasing the number of windings in the coil
d. None of these increases the force of an
electromagnet.
6. A compass reads the Earth's magnetic field. Does a
compass function the same when south of the Earth's
equator as when north of the equator?
a. No, it will point in the opposite direction.
b. Yes, it will always point to magnetic south.
c. Yes, it will always point to magnetic north.
d. None of these answers is correct.
7. When a magnet is subjected to heat, its magnetism
will
8. Lodestone has a valued property that has been used
for centuries. What is it?
a. decrease.
b. stay the same.
c. reverse polarity.
d. increase.
a. The stone is magnetic.
b. The stone floats.
c. The stone is very heavy.
d. The stone glows in the dark.
9. In which of these environments would a compass
work normally?
10. Iron filings reveal this in the magnetic field
surrounding a bar magnet.
a. in a lightning storm
b. in orbit around the Earth
c. at the magnetic north pole
d. underwater
a. the lines of the magnetic force
b. the polarity of the magnet
c. both 1 and 2
d. neither 1 nor 2
Electromagnet Activity – Assessment
11. The main advantage of an electromagnet over a
permanent magnet is that:
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12. The only way to prove that an object is a magnet
is to:
a. An electromagnet can be turned on and off very
easily.
b. An electromagnet is cheaper to make.
c. An electromagnet is easier to make.
d. There is no advantage.
13. The field lines around a bar magnet always point
from
a. show that it is able to repel another magnet.
b. show that it is able to attract another magnet.
c. show that another magnet will stick to it.
d. show that earth is magnetic.
a. north to south pole
b. south to north pole
a. true
b. false
15. Which scientist studied the relationship between
electricity and magnetism? He discovered that
magnetic fields are produced by moving charges
(current). And moving charges are affected by
magnets.
16. Which of these metals is magnetic?
a. Alex Dunn
b. Andre-Marie Ampere
c. Joseph Louis Gay-Lussac
d. Alessandro Volta
e. Hans Christian Oersted
14. Changes in the flow of electricity can change the
magnetic properties of an object.
a. aluminum (Al)
b. lead (Pb)
c. iron (Fe)
d. copper (Cu)