Electromagnets

Refrigerator magnets and bar magnets are what type of magnet?

• electromagnet

• electronic

• permanent

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

• stronger

• weaker

• opposite

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NGSS.MS-PS2-3

NGSS.MS-PS2-5

What kind of magnet can be turned on and off?

• refridgerator magnet
• electromagnet
• magnetite
• iron

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NGSS.HS-PS2-5

Electric currents produce _____________

• electron clouds

• magnetic fields

• sound waves

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NGSS.MS-PS2-5

When _______________ travels through a

conductor, a magnetic field is created

• current

• a magnetic field

• neutrons

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

• increase the current flowing through the coil

• increase the number of coils

• add an amplifier to it

• put iron core inside the coil

What is most likely to happen when the switch is closed?

• A magnetic field should be produced
• The nail will rust
• The battery will explode
• The wire will catch on fire

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
• D. All of the above

Tags

NGSS.MS-PS2-3

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

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

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