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WorksheetsElectromagnetism
Total questions: 17
Worksheet time: 9mins
Name
Class
Date
1.
Why does a compass always point north?
a)
The needle is a magnet and it aligns itself with the Earth's magnetic fields
b)
Earth is a magnet and it attracts all metal objects towards the north
c)
Earth's south pole does not have a magnetic pull
d)
All magnets have a north and south pole
2.
What would increase the strength of an electromagnet?
a)
Increasing the amount of current flowing through the wire.
b)
Inserting a wooden core inside the coil
c)
Changing the direction of the current
d)
Decreasing the number of coils of wire
3.
When a bar magnet is broken in half, what is the result?
a)
Two N poles
b)
Two S poles
c)
Two N poles and two S poles
d)
The bar loses its magnetic properties
4.
Magnetic Field lines....
a)
Go out of the N side and into the S side
b)
Go out of the S side and into the N side
c)
Go out of the N side AND out of the S side
d)
Go into the N side AND go into the S side
5.
A moving magnetic field causes current to flow is called...
a)
Electromagnetic Induction
b)
Magnetism
c)
North Pole
d)
Generator
6.
A device that converts electrical energy into mechanical energy
a)
A. electromagnet
b)
B. electromagnetic induction
c)
C. electric motor
d)
D. electromagnetism
7.
What kind of magnet can be turned on and off?
a)
refrigerator magnet
b)
electromagnet
c)
magnetite
d)
iron
8.
British scientist who discovered that a changing magnetic field can produce an electric current.
a)
Hans Christian Oersted
b)
Michael Faraday
c)
Thomas Edison
d)
Troy Nasworthy
9.
A tiny region in a magnet where all the atoms are grouped together and their poles are aligned.
a)
Domain
b)
North
c)
South
d)
Commutator
10.
Spinning electrons themselves are small
a)
magnets.
b)
atoms.
c)
generators.
d)
joules.
11.
If you wrap more coils around an electromagnet, it will become...
a)
brighter
b)
stronger
c)
weaker
d)
invisible
12.
A hydroelectric plant in Niagara Falls sends 3000 V to the transformer in a substation that steps it up to 120000 V for transmission to homes in New York City. If the primary coil contains 2000 turns, how many turns are there in the secondary coil of the step-up transformer?
a)
180000 turns
b)
8000 turns
c)
2000000 turns
d)
3600 turns
13.
This material is hard to magnetize, but stays magnetized
a)
temporary
b)
permanent
c)
ferromagnet
d)
electromagnet
14.
As an electron moves, it makes, or induces a(n)
a)
acceleration.
b)
ferromagnet.
c)
chemical reaction.
d)
magnetic field.
15.
Materials in which the atoms' magnetic fields cancel each other out are
a)
aligned in domains.
b)
like iron, nickel, and cobalt
c)
not magnetic
d)
magnetic
16.
Which of the following does NOT cause the domains of a magnet's atoms to lose alignment?
a)
Dropping the magnet
b)
Hitting the magnet too hard
c)
Increasing the temperature of the magnet
d)
Putting the magnet in the refrigerator
17.
How do you magnetize something made of iron, cobalt, or nickel?
a)
Rub one end of the magnet in one direction to align the domains.
b)
Put the materials in extreme temperatures.
c)
Melt all of the materials together
d)
These materials cannot be magnetized.
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