Introduction to Electrostatics

What is charge imbalance?

• an accumulation of net charges from other objects

• a balance of the two charges

• the number of positively charged objects

• the number of negatively charged objects

When does static build up most likely to occur?

• when there is charge separation among objects

• when there is a positive and negative cloud

• when one of the materials involved is an insulator

• when the objects are both neutral

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If the charge on each of two small charged metal spheres is doubled and the distance between the spheres remains fixed, the magnitude of the electric force between the spheres will be

• two times as great

• four times as great

• one-half as great

• the same

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Two protons are located one meter apart. Compared to the

gravitational force of attraction between the two protons, the electrostatic force between the protons is

• weaker and attractive

• stronger and attractive

• stronger and repulsive

• weaker and repulsive

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What eventually happens to objects that are charged with static electricity?

• They destroy electrons forever

• They transfer electrons to air or as a spark to another object

• They transfer neutrons to the air

• They create more protons to become neutral

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The ​ (a)   charges in the girl's hair are attracted to the negative charge in the balloon.

• positive

• negative

• neutral

• static

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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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Rubbing the balloon on the sweater allows more electrons to move onto the balloon. This gives the ballon a ​ (a)   charge.

• negative

• positive

• neutral

• powerful

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Which of the following best describes what is being created in the picture?

• static electricity

• potential energy

• magnetic field

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The balloon will move toward the

(a)   because the ​ (b)   charges on the balloon are ​ (c)   the ​ (d)   charged on the sweater.​ ​

• sweater

• negative

• attached to

• positive

• repelled by

• balloon

• wall

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