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

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The SI unit of magnetic field is 

• weber
• guass
• tesla
• farad

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What is this?

• permanent magnet

• electromagnet
• series circuit
• parallel circuit

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How do electromagnets differ from regular magnets? 

• They  can be turned off and on 

• Their polarity can be reversed

• Their strength can be changed

• All of these answers

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NGSS.MS-PS2-3

Which statement is true?

• Two N poles attract each other.

• Two S poles attract each other.

• A N pole and a S pole will repel each other.

• A N pole and a S pole will attract each other.

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NGSS.MS-PS2-5

Which coil will produce the strongest magnetic field?

• 
• 
• 
• 

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NGSS.MS-PS2-3

How does Earth's magnetic field affect compasses?

• Earth's magnetic field aligns the compass needle with the magnetic field lines.

• Earth's magnetic field causes the compass needle to spin randomly.

• Earth's magnetic field has no effect on compasses.

• Earth's magnetic field repels the compass needle.

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.

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NGSS.MS-PS2-3

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

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

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What is the role of Earth's magnetic field in protecting the planet?

• Earth's magnetic field protects the planet from harmful solar radiation and charged particles.

• Earth's magnetic field is used for navigation by animals and birds.

• Earth's magnetic field is responsible for causing earthquakes and volcanic eruptions.

• Earth's magnetic field helps in regulating the planet's temperature.