Magnetism Review

What are 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

How are bar magnets different from electromagnets?

• they require electricity to produce a magnetic field

• they maintain a magnetic field at all times

• they produce a magnetic field only when pointed north

• they stop being magnetic near other magnets

What is an advantage of an electromagnet?

• it can be turned on and off

• it does not need a power source to operate

• it is a permanent magnet

• it cannot be made stronger

Which is a property of electromagnets and bar magnets?

• they include an electrical sources

• they are created by an electric current

• they have a north and south pole

• they have a magnetic field that can be strengthened or weakened

Which type of magnets have a magnetic field?

• bar magnets

• electromagnets

• bar magnets and electromagnets

• neither bar magnets nor electromagnets

Tags

NGSS.MS-PS2-5

What kind of magnet carries an electric current?

• permanent magnet

• electromagnet

• bar magnet

• horseshoe magnet

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

• they 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

• electromagnets turn off and shut the doors when the alarm is triggered

Tags

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NGSS.MS-ETS1-2

To work an electromagnet must be part of a

• battery

• open circuit

• electric crane

• electrical circuit

Bar magnets always attract paper clips because

• it is a temporary magnet

• it has a permanent magnetic field

• it cannot be used to pick up metal objects

• it will only attract and lift heavy objects

Tags

NGSS.MS-PS2-5

What kind of magnet will you use to hang a poster on the refrigerator?

• bar magnet

• electromagnet

• open circuit magnet

• pole magnet