Why does a compass needle point north?

It lines up with the Earth's magnetic field

The strength of an electromagnet can be affected by

changing the current in the wire

changing the space between the wires

How do electromagnets differ from regular magnets?

A. They can be turned off and on

B. Their polarity can be reversed

C. Their strength can be changed

Where does a magnetic field occur in relation to an electrified wire?

Around the entire length of wire

At either end, but not in the middle

Only the side closest to source

Only the side furthest from source

What will most likely have to happen for an electromagnet to drop a car?

The electric current that is creating the magnetic force will have to be turned off.

A bar magnet will have to be placed underneath the car to cancel the magnetic force.

The driver will have to place a non-metal object between the magnet and the car.

The driver will have to heat the magnet to the point where it no longer has a magnetic force.

Which device should be built using a bar magnet instead of an electromagnet?

a fridge door that needs to stay closed

a magnetic door lock that needs to be able to be unlocked

a stereo speaker that needs to be able to vary the volume

a blender that needs to be able to vary speeds

Are the magnetic field lines in the picture correct?

Yes, because they point from north to south.

No, because they point from north to south (they're supposed to go the other way).

Yes, because the North pole is on the left in all pictures.

No, because the North pole is on the left in all pictures (it's supposed to be on the right).

Year 8 - Electromagnets Quiz

23 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What subject is attracted to a magnet?

Silver

Water

Metal

Iron

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What happens when two north poles of a magnet are placed together?

they repel

they attract

they cancel each other out

the strength of the magnet is doubled

Tags

NGSS.MS-PS2-3

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What will happen when these magnets are brought close together?

They will attract each other.

They will repel each other.

Both magnets will turn to the left

Both magnets will turn to the right

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

4.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Where is the force of attraction the strongest on a magnet?

at the poles

in the middle

above the magnet

below the magnet

Tags

NGSS.MS-PS2-3

5.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

A force of attraction or repulsion between the poles of two magnets.

magnets

magnetic poles

magnetic force

magnetic fields

Tags

NGSS.MS-PS2-5

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The invisible field that surrounds a magnet.

magnets

magnetic poles

magnetic force

magnetic fields

Tags

NGSS.MS-PS2-5

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

a magnet that quickly loses its magnetic field after being removed from a magnetic field

temporary magnet

permanent magnet

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Year 8 - Electromagnets

What subject is attracted to a magnet?

What happens when two north poles of a magnet are placed together?

What will happen when these magnets are brought close together?

Where is the force of attraction the strongest on a magnet?

A force of attraction or repulsion between the poles of two magnets.

The invisible field that surrounds a magnet.

a magnet that quickly loses its magnetic field after being removed from a magnetic field

a magnet that remains a magnet after being removed from a magnetic field

Why does a compass needle point north?

A _______________ is a current-carrying coil of wire with many loops

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