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WorksheetsElectromagnetic Induction
Total questions: 23
Worksheet time: 14mins
Name
Class
Date
1.
If a magnet is pushed into a coil, voltage is induced across the coil. If the same magnet is pushed
into a coil with twice the number of loops,
into a coil with twice the number of loops,
a)
a. one-half as much voltage is induced.
b)
b. the same voltage is induced.
c)
c. twice as much voltage is induced.
d)
d. four times as much voltage is induced.
2.
A generator is used to light a bulb. Energy for lighting the bulb actually comes from a
a)
coil or wire
b)
mechanical intput to the generator
c)
magnet in the generator
d)
plug where the generator is connected to the wall
3.
As electrons move, they make
a)
A. electromagnetism.
b)
B. auroras.
c)
C. ferromagnetism.
d)
D. magnetic
fields.
4.
A device that converts electrical energy into mechanical energy
a)
A. electromagnet
b)
B. electromagnetic induction
c)
C. electric motor
d)
D. electromagnetism
5.
A device that converts mechanical energy into electrical energy
a)
A. electric generator
b)
B. electric motor
c)
C. electromagnetic induction
d)
D. mechanical generator
6.
The process of creating a current in a circuit by changing a magnetic field
a)
A. electric generator
b)
B. electric motor
c)
C. electromagnetic induction
d)
D. magnet
7.
What kind of magnet can be turned on and off?
a)
refrigerator magnet
b)
electromagnet
c)
magnetite
d)
iron
8.
If you wrap more coils around an electromagnet, it will become
a)
brighter
b)
stronger
c)
weaker
d)
invisible
9.
What is inside a toy car that turns the wheels?
a)
generator
b)
electric motor
c)
electromagnet
10.
A magnet can move in a coil of wire to produce electricity in which system?
a)
Generator
b)
Motor
c)
Magnet
d)
Transformer
11.
What benefit is gained by the addition of the iron core in an electromagnet?
a)
It makes a strong magnet weaker
b)
It makes a weak magnet stronger
c)
There is no benefit at all
d)
It lets currents interact with each other
12.
What is it called when you can use a magnetic field to create an electric current in a wire?
a)
Electromagnetic induction
b)
Electromagnetic radiation
c)
Electromagnetic conduction
d)
Radio waves
13.
An electric current can produce a magnetic field.
a)
True
b)
False
14.
How can an electromagnet be helpful in a junkyard?
a)
It can help the workers move around the yard.
b)
It can covert electrical energy into mechanical energy.
c)
It can move heavy pieces of metal.
d)
It can send out voltage waves.
15.
Which item does NOT use an electromagnet.
a)
A Ferris wheel
b)
A doorbell
c)
A galvonometer
d)
A handheld compass
16.
What would happen if I move a bar magnet in and out of a coil of copper wire?
a)
Electric current would disappear
b)
The magnet would explode
c)
Electric current will flow through the wire
d)
It would produce a gravitational field
17.
What is one way to increase the current in a wire?
a)
Decrease the number of coils
b)
Increase the number of coils
c)
Move the magnet slower
d)
Take the wire off of the magnet
18.
How does the function of a generator relate to the function of a motor?
a)
They are the same
b)
They are opposites
c)
They both work the same way
d)
They are not related at all
19.
When there is a change in the magnetic field in a closed loop of wire
a)
(a) a voltage is induced in the wire
b)
(b) current is made to flow in the loop of wire
c)
(c) electromagnetic induction occurs
d)
(d) all of these
20.
What is created when a magnet moves through a coil of wire?
a)
A. an
electromagnet
b)
B. a ferromagnet
c)
C. a
solenoid
d)
D. an
electric current
21.
The strength of an electromagnet decreases when you increase the current.
a)
True
b)
False
22.
Thrust a magnet into a coil of wire. While the magnet is being moved toward the coil
a)
(a) becomes an electromagnet
b)
(b) has a current in it
c)
(c) both of these
d)
(d) neither of these
23.
Generators use induction to produce electricity.
a)
True
b)
False
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