Magnetism Check

Identify the parts of an electromagnet.

• battery, battery holder, nail, copper wire

• battery, battery holder, bulb, copper wire

• battery, battery holder, nail, bulb

• battery, battery holder, switch, copper wire

Bar magnets are different from electromagnets because bar magnets,

• require electricity to produce a magnetic field

• always have a magnetic field

• produce a magnetic field only when pointed north

• stop being magnetic near other magnets

What is one advantage of an electromagnet?

• An electromagnet can be turned on and off.

• An electromagnet does not need a power source to operate.

• An electromagnet is a permanent magnet.

• An electromagnet cannot be made stronger.

Which type of magnets have a magnetic field?

• ONLY bar magnets

• ONLY electromagnets

• BOTH bar magnets and electromagnets

• NEITHER bar magnets nor electromagnets

What kind of magnet carries an electric current?

• permanent magnet

• electromagnet

• bar magnet

• horseshoe magnet

Tags

NGSS.MS-PS2-5

Why are the fireproof doors in your school held open by electromagnets instead of bar magnets?

• Electromagnets are cheaper to install and save money.

• Bar magnets cause interference with the wifi.

• Bar magnets aren’t strong enough to hold open a fireproof door.

• The electromagnets turn off when the fire alarm is triggered; shutting the doors automatically.

To work, an electromagnet must be a part of

• a. a battery

• b. an open circuit

• c. an electric crane

• d. an electrical circuit

A bar magnet will always attract paper clips because

• A bar magnet is a temporary magnet.

• A bar magnet has a permanent magnetic field.

• A bar magnet cannot be used to pick up metal objects.

• A bar magnet will only attract and lift heavy objects.

Tags

NGSS.MS-PS2-5

Sadie wants to hang a poster of the Atlanta Braves on her refrigerator. She has lots of different magnets. What kind of magnet should she use to hang her poster on the refrigerator?

• bar magnet

• electromagnet

• open circuit magnet

• pole magnet

A student is comparing two types of magnets. The student asks 5 questions and then finds the answers to the questions by experimenting with the magnets. The results are shown in the table.

Based on the evidence, which TWO arguments correctly match a magnet to its best use?

• Magnet 1 should be used to pick up magnetic objects in one location and drop them off in another location because temporary magnets can be turned on and off.

• Magnet 2 should be used to pick up magnetic objects in places where there is no power supply because permanent magnets do not run out of energy.

• Magnet 2 should be used to pick up large magnetic objects because permanent magnets are stronger than temporary magnets.

• Magnet 1 should be used to pick up iron nails out of a pile, because only Magnet 1 can attract iron, nickel, and cobalt.

Tags

NGSS.MS-ETS1-2

NGSS.MS-ETS1-3