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

How can the strength of an electromagnet be increased? (mark all that apply)

increase the current flowing through the coil

Permanent Magnets and Electromagnets are similar in which TWO ways?

they both have a north and south pole

they are surrounded by a magnetic field

A strong electromagnet is used to attract pins. What happens when the current in the coil is halved?

Some pins are attracted, but not as many.

The same number of pins is attracted.

Electric current is passing through a wire. Under which circumstances below will a magnetic field be created around the wire?

A magnetic field is always created around a wire when it carries electric current.

Only when the wire is absolutely straight.

Only when the wire makes a complete loop

Only when the current comes from a battery.

How are electromagnets different from magnets?

you can turn an electromagnet on/off

magnets have a North and South pole

Finish this sentence: "As the electric current through a wire INCREASES..."

The magnetic field around the wire becomes stronger

The magnetic field around the wire becomes weaker

The magnetic field around the wire stays the same

Which of the following is FALSE?

The current will not flow through a wire if the magnet is outside of the coil

The direction a coil of wire moves through a magnetic field determines the direction of the electric current

Current will flow through a wire as long as the magnetic field around the coil is changing.

Fill in the Blank: By changing the current in the wire, you can change the ___________ of an electromagnet.

strength and polarity (where North and South Poles are located)

Which is the best prediction for what will happen to the needle on the meter when the magnet stops moving and then is moved DOWN through the loop of the wire?

The reading will drop to zero and then move in the opposite direction

The reading will drop to zero and then return to the same reading

In the figure shown, what happens when the amount of current flowing in the wire coil is increased?

The magnetic field becomes stronger

The magnetic field becomes weaker

The position of the north and south poles is reversed

In the figure shown, what happens when the direction of current flowing in the wire coil is reversed?

The position of the north and south poles is reversed

The magnetic field becomes weaker

The magnetic field becomes stronger

Select which of the following does NOT increase the strength of an electromagnet.

Increase the distance from the coils

Increase the number of wire coils

Electromagnetism

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31 questions

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MULTIPLE CHOICE QUESTION

2 mins • 1 pt

This picture best illustrates the construction of a(n)

magnet

electromagnet

series circuit

parallel circuit

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

How do you make an electromagnet stronger?

Add a motor and/or lightbulbs

Add more light bulbs and/or wire coils

add more wire coils and/or a switch

add more wire coils and/or batteries

Tags

NGSS.MS-PS2-3

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

What is true about electricity and magnetic fields?

Electricity is needed to create any magnet.

Electricity always creates a magnetic field.

Electricity is stronger than a magnetic field.

Electricity prevents magnetic fields from occurring.

Tags

NGSS.3-PS2-3

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

This is a picture of a simple electromagnet. How can the electromagnet be made stronger?

Add more coils of wire to the nail.

Use a smaller battery.

Reverse the poles of the magnet.

Remove all the coils and the nail.

Tags

NGSS.MS-PS2-3

NGSS.MS-ETS1-2

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

What kind of magnet can be turned on and off?

refridgerator magnet

electromagnet

magnetite

iron

Tags

NGSS.MS-PS2-3

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Which of the following is not a good conductor?

Copper

Silver

Aluminium

Plastic

Tags

NGSS.5-PS1-3

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

If you wrap more coils around an electromagnet, it will become

brighter

stronger

weaker

invisible

Tags

NGSS.MS-PS2-3

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Electromagnetism

This picture best illustrates the construction of a(n)

How do you make an electromagnet stronger?

What is true about electricity and magnetic fields?

This is a picture of a simple electromagnet. How can the electromagnet be made stronger?

What kind of magnet can be turned on and off?

Which of the following is not a good conductor?

If you wrap more coils around an electromagnet, it will become

What is the flow of electricity?

a magnetic crane picks up pieces of metal in the picture. the crane magnet is made by electrified current and a coil. Most likely, what element is the metal?

These magnetic domains are:

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