ch36.ppt

Multiple Choice

Which of the following discoveries led to the realization that electricity and magnetism are related phenomena?

• The invention of the electric motor

• The deflection of the compass needle by electric current

• The discovery of radio waves

• The use of magnets in television screens

Open Ended

Why is the relationship between electricity and magnetism significant in the development of modern technology?

Open Ended

Explain how the strength of the interaction between two magnets changes as the distance between them increases.

Multiple Choice

Which of the following statements best describes the interaction between magnetic poles?

• Like poles attract; opposite poles repel.

• Like poles repel; opposite poles attract.

• Both like and opposite poles repel.

• Both like and opposite poles attract.

Fill in the Blanks

Which interaction has the greater strength—the gravitational attraction between the scrap iron and Earth, or the magnetic attraction between the magnet and the scrap iron?

Multiple Select

Which of the following statements about magnetic poles is/are correct?

• A magnet has both a north and a south pole.

• The north-seeking pole points southward.

• The poles of a bar magnet are located at the center.

• The south-seeking pole points southward.

Multiple Choice

What happens when the north pole of one magnet is brought near the north pole of another magnet?

• They attract each other.

• They repel each other.

• Nothing happens.

• They combine to form a larger magnet.

Open Ended

Why can't magnetic poles be isolated like electric charges?

Open Ended

Explain why atoms themselves are considered magnets based on the behavior of bar magnets when broken into smaller pieces.

Multiple Choice

What happens when you break a bar magnet into smaller pieces?

• Each piece becomes a complete magnet with both north and south poles.

• Only the largest piece remains magnetic.

• The pieces lose their magnetic properties.

• Each piece has only one pole.

Multiple Choice

Which of the following statements about magnetic poles is correct?

• Every magnet has at least two poles.

• Magnets can have only one pole.

• Magnets lose their poles when broken.

• Atoms cannot be magnets.

Fill in the Blanks

Does every magnet necessarily have a north and a south pole?

Open Ended

How do magnetic poles affect each other?

Fill in the Blanks

The direction of the magnetic field outside a magnet is from the

to the south pole.

Multiple Choice

What is revealed when iron filings are sprinkled over a sheet of paper placed on top of a bar magnet?

• The shape of the magnetic field lines

• The color of the magnet

• The temperature of the magnet

• The weight of the magnet

Open Ended

Explain how magnetic field lines behave around a bar magnet, based on the information from the slides.

Fill in the Blanks

When two magnets are placed with their opposite poles near each other, the magnetic field lines will

between the poles.

Open Ended

What happens to the orientation of a small compass placed anywhere in the magnetic field of a bar magnet?

Multiple Choice

Which of the following statements about magnetic field strength is correct?

• The field strength is greater where the lines are closer together.

• The field strength is weaker at the poles.

• The field strength is the same everywhere around the magnet.

• The field strength is unrelated to the spacing of the lines.

Open Ended

What is the direction of the magnetic field outside a magnet?

Multiple Choice

Which of the following statements best explains the relationship between electricity and magnetism as described in the slides?

• A magnetic field is produced by the motion of electric charge.

• A magnetic field is produced by a stationary electric charge.

• Electricity and magnetism are unrelated phenomena.

• A magnetic field is only produced by magnets.

Fill in the Blanks

In most materials, the field due to

predominates over the field due to orbital motion.

Open Ended

Explain how the motion of electrons within atoms contributes to the magnetic properties of materials.

Multiple Select

Which of the following are true about spinning electrons and their contribution to magnetism?

• A pair of electrons spinning in the same direction makes up a stronger magnet.

• Electrons spinning in opposite directions work against one another.

• Their magnetic fields cancel.

• Electrons spinning in the same direction cancel each other's magnetic fields.

Fill in the Blanks

An iron atom has four electrons whose spin magnetism is not

.

Open Ended

Why are most substances not magnets, and what is different about materials like iron, nickel, and cobalt?

Open Ended

Reflecting on today's lesson about magnetism, what is one question you still have or one concept you would like to explore further?

Multiple Choice

How did the discovery of the relationship between electricity and magnetism impact technological advancements?

• It led to the development of electric power, radio, and television.

• It only affected the study of magnets.

• It made compasses obsolete.

• It had no impact on technology.