Electric and Magnetic Forces Review

Which comination of charges will attact eachother?

• positive charge and positive charge

• positive charge and negative charge

• negative charge and negative charge

• no charge and no charge

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Which change will decrease the electric force between two charged objects?

• Add more electric charges to them

• Bring them close together

• Move them far apart

• Rub them together

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What does an imbalance of positive and negative charges cause?

• static electricity

• magnetic attraction

• objects to repel each other

• all of the above

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Which of these events is caused by electric charges?

• an earthquake

• a lightning strike

• a snowstorm

• a flood

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Paul has three balloons and three piles of shredded paper. He wants to see which balloon will attract more pieces of paper. Based on what Paul knows about electric force, which prediction would he MOST LIKELY make about the balloons?

• Balloon A will pick up the most papers because the forces are farthest apart.

• Balloon C will pick up the most papers becuase the forces are closest together.

• Balloons A, B, and C will pick up the same amound of paper because the balloons are the same size.

• Ballons A, B, and C will pick up the same amount of paper because the papers are the same size.

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What is an electric force?

• a build up of electric charges in an object

• an impalance of positive and negative charges

• the speed that two like objects repel each other

• a push or pull between objects that have an electric charge

Two positive electric charges __________ each other.

• repel

• attract

• pull toward

• imbalance

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Which of the following would have the strongest pull toward each other?

• like charges that are far apart

• unlike charges that are far apart

• like charges that are close together

• unlike charges that are close together

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Static Electricity is created when

• unlike charges repel eachother

• like electric charges pull toward each other

• there is an imbalance of positive and negative charges

• electric forces are strong between objects close together

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Which of the following is an example of electric charges repelling?

• clothes rubbing together in the dryer

• two balloons pushing each other apart

• a balloon with a charge lifting your hair

• a spark moving from your clothes to another object

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