Magnetism

What would cause the attractive force between two magnets to increase?

• The unlike poles of the magnets are pointed at each other and move closer together.

• The like poles of the magnets are pointed at each other and move closer together.

• The like poles of the magnets are pointed at each other and move farther apart.

• The unlike poles of the magnets are pointed at each other and move farther apart.

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Which of these determines whether or not a material is magnetic?

• the number of elements that make up

  the material

• the alignment of atoms in the material

• the density of the material

• the weight of the material on Earth

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Candice claims that all magnets have two magnetic poles. Which of these observations would best support her claim?

• The north pole of a compass needle is attracted to the south pole of a bar magnet.

• The strength of the magnetic force from a bar magnet decreases as the magnet is pulled away from another object.

• Iron is attracted to a magnet but not to other pieces of iron.

• When a bar magnet is cut in half, each half has a north pole and a south pole.

Kim has two bar magnets. First, she places them beside one another, as shown in Picture A. Then, she moves one of the bar magnets so they are placed as shown in Picture B. How did the magnetic force change?

• The bars go from repelling each other to attracting each other.

• The bars go from attracting each other to the second bar rotating.

• The bars go from attracting each other to repelling each other.

• The bars go from repelling each other to the second bar rotating.

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Angela tries to pick up a copper penny using a bar magnet, but the penny does not move. Next, she tries to pick up an iron nail using the bar magnet, and the nail lifts up toward the magnet. Which of the following best describes a ferromagnetic material like iron?

• Ferromagnetic materials produce their own magnetic force.

• Ferromagnetic materials are nonmetals that produce magnetic forces.

• Ferromagnetic materials conduct electricity easily.

• Ferromagnetic materials have magnetic domains that align with a magnetic field.

Why can some objects be magnetized by rubbing one pole of an existing magnet in one direction along the object?

• The motion of the existing magnet against the object wears away the object’s surface, exposing the naturally occurring magnets underneath.

• The motion of the existing magnet against the object generates an electric current that transforms the object into an electromagnet.

• The motion of the existing magnet against the object scrambles, or unaligns, the magnetic domains of the object.

• The motion of the existing magnet against the object aligns the magnetic domains of the object.

A magician wants to use magnets to create a new illusion for her show. She plans to hide strong magnets in her shoes and inside a special rug on the stage. When she tests the illusion, she finds that her shoes stick to the rug. What will happen if she flips the poles of the magnets in each of her shoes?

• Her shoes will no longer be affected by

  the rug.

• Her shoes will float above the rug.

• Her shoes will stick to each other instead of to the rug.

• Her shoes will still be stuck to the rug.

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When two magnets repel each other which poles are facing each other?

• North and South
• South and North
• North and North
• Positive and Negative

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How are the domains of an ordinary piece of metal organized?

• The domains are very strong
• The domains are all mixed up
• The domains all point in the same direction
• There is no such thing as domains

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The strongest part of a magnet is...

• the bars.
• the force field.
• the poles. 
• the middle.

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