Forces and Force Fields

As the electrical current in a wire increases, what will happen to the magnetic field it produces?

• It will decrease.

• It will increase.

• It will stay the same.

• It will proceed to the buffet line.

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Which of the following would increase the strength of an electromagnet?

• increasing the insulation around the wire

• decreasing how much you yell at it

• decreasing the number of wire coils

• increasing the strength of the battery

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Which of the two below result in an attractive force?

• A positive charge and a negative charge

• Two negative charges

• Two south poles

• A north pole and a south pole

• Two postive charges

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repel

• to push objects away from each other

• to provide evidence that goes against a claim

• an object, diagram, or computer program that helps us

• when two objects come close together

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Where is the force of attraction the strongest on a magnet?

• at the poles

• in the middle

• above the magnet

• below the magnet

magnetic field

• the space around a magnet in which magnetic forces can act on objects

• to separate or set apart

• one of the two opposite ends of a magnet

• to provide evidence that goes against a claim

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Attract

• To pull objects close to each other

• to push objects away from each other

• to change from one type to another

• an electric current 

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Static electricity is the buildup of charges between two objects. What best explains why a balloon is attracted to hair when the two have been rubbed together?

• The balloon and hair both have positive charges

• The balloon and the hair both have negative charges

• The balloon and the hair both have neutral charges

• The balloon and the hair both have opposite charges

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Two bar magnets are held close together. They are released and allowed to move freely. The bar magnets quickly come together. Which best explains why this happens?

• The poles facing one another are both south poles

• The poles facing one another are both north poles

• The poles facing one another are opposite poles

• One magnet was bigger than the other

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Frederick sets paper clips out on a table. He then takes a magnet, places it directly beneath the paper clips under the table, and moves the magnet. He finds that the paper clips move with the magnet. Why does this happen?

• Magnetic force is a repellant force

• Magnetic forces act on wood, like in the table

• The paper clips are feeling the gravitational force of the magnet

• Magnetic forces act at a distance, even betwewn objects

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