Electricity and Electromagnet

Which can increase the strength of an electromagnet?

• increasing the number of coils around the nail

• increasing the number of batteries

• adding an iron core

• all of the above

It is a kind of magnet that works only when there is a flow of electricity.

• Electromagnet

• Bar Magnet

• Horse Shoe Magnet

• Magnetite

Which of the following are magnetic poles?

• North and South
• East and West
• Left and Right
• Red and Blue

Tags

NGSS.MS-PS2-3

What do two unlike poles do when they are brought close together?

• Nothing
• Repel
• Attract
• Decrease

Tags

NGSS.MS-PS2-3

The arrow on magnetic field lines shows them flowing in which direction?

• Left to Right
• North to South
• South to North
• Right to Left

Tags

NGSS.MS-PS2-3

What do two unlike poles do when they are brought close together?

• Nothing
• Attract
• Repel
• Decrease

Tags

NGSS.3-PS2-3

What is one difference between electromagnets and bar magnets?

• Bar magnets can be turned off but electromagnets cannot
• Electromagnets need electricity but bar magnets do not
• Bar magnets have a magnetic field but electromagnets do not
• Bar magnets are bigger than electromagnets

Tags

NGSS.MS-PS2-3

Which statement best describes an insulator?

• A material that allows electtons to flow through it

• A material that does not allow liquids to flow through it
• A material that does not allow electrons to flow through it

• A material that cools down quickly when heated

If resistance decreases, what has likely happened to current?

• It increased.
• It decreased.
• It stayed the same.

How is voltage measured?

• Volts
• Ohms
• Amps
• Watts