Electromagnets
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• Question 1
900 seconds
Q.

A magnetic field is a force field created by

gravity

force

magnets

• Question 2
900 seconds
Q.

Arrows are close together on a force field when the force is

stronger

weaker

opposite

• Question 3
900 seconds
Q.

A compass needle shows us the magnetic field of

the sun

Earth

the moon

a magnet that is near by

• Question 4
900 seconds
Q.

Earth has a magnetic field that is similar to a bar magnet's magnetic field.

true

false

• Question 5
900 seconds
Q.

Earth's magnetic South Pole is near Earth's geographic North Pole

true

false

• Question 6
900 seconds
Q.

Electronic devices create magnetic fields because they

are magnets

are compasses

have moving particles with electric charge

• Question 7
900 seconds
Q.

A compass needle points north because of Earth's magnetic field unless

it is close to a wire with a current

it is close to any wire

it is close to a battery

• Question 8
900 seconds
Q.

How can you test to see if there is a current running through a wire?

listen carefully to see if you hear a buzzing sound

place several compasses around the wire

place several batteries around the wire

• Question 9
900 seconds
Q.

The compass needles are turned by magnetic forces caused by electric current. The magnetic forces caused by an electric current are one kind of

gravitational force

gravitational field

electromagnetic force

• Question 10
900 seconds
Q.

The electromagnetic forces from a current carrying wire are strong enough to move the compass needle. The forces can be made stronger by

making the wire shorter

making the wire longer

making the wire into loops

• Question 11
900 seconds
Q.

An electromagnet is a magnet that

its strength can be varied and turned on and off

always has a magnetic field around it

has very little strength

• Question 12
900 seconds
Q.

Refrigerator magnets and bar magnets are what type of magnet?

electromagnet

electronic

permanent

• Question 13
900 seconds
Q.

What THREE ways are electromagnets different from permanent magnets?

they can be turned off and on

they can increase in strength by increasing the current in the wire

they are smaller in size

they can change which is the north and south pole

• Question 14
900 seconds
Q.

Electromagnets are useful in industry such as a junk yard because they

have strong north and south poles

are easy to lift

can be turned off and on

• Question 15
900 seconds
Q.

Permanent Magnets and Electromagnets are similar in which TWO ways?

it can be turned off and on

they both have a north and south pole

they are surrounded by a magnetic field

• Question 16
900 seconds
Q.

A force that can act at a distance is called