Magnets and Electromagnets

The end of the magnet where the lines go in represents ___.

• a magnetic domain

• the magnet's S pole

• the magnet's N pole

• the nonmagnetic part

The SI unit of magnetic field is 

• weber
• guass
• tesla
• farad

Tags

NGSS.MS-PS2-5

What is this?

• magnet
• electromagnet
• series circuit
• parallel circuit

Tags

NGSS.MS-PS2-3

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

Which statement is true?

• Two north poles attract each other.

• Two south poles attract each other.

• A north pole and a south pole will repel each other.

• A north pole and a south pole will attract each other.

Which coil will produce the strongest magnetic field?

• 
• 
• 
• 

What is the effect of increasing the number of coils in an electromagnet?

• The magnetic field weakens

• The magnetic field strengthens

• The magnetic field disappears

• The magnetic field remains unchanged

Answer explanation

Increasing the number of coils in an electromagnet enhances the magnetic field strength. More coils create a stronger cumulative effect of the magnetic field generated by the electric current.

What is the main difference between electric fields and magnetic fields?

• Electric fields are created by stationary charges, while magnetic fields are created by moving charges

• Electric fields can exist without magnetic fields, but magnetic fields cannot exist without electric fields

• Magnetic fields can do work, but electric fields cannot

• Electric fields are always circular, while magnetic fields are straight

Tags

NGSS.HS-PS2-5

Where on a magnet is the magnetic force the strongest?

• at the poles

• in the middle

• above the magnet

• below the magnet

What is not true about magnets or electromagnets?

• All magnets have a force
• Magnets are attracted to all kinds of metal.
• Magnets attract iron.
• Magnets can pull on some objects without touching them.