Introduction to Electrostatics

The magnitude of the electrostatic force between two point charges is F. If the distance between the charges is doubled, the electrostatic force between the charges will become

• 4F

• 2F

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Electrostatic force F exists between two point charges. If the distance between the charges is tripled, the force between the charges will be

• 9F

• 3F

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When an object gains electrons it becomes __________

• Neutral

• Positively charged

• Negatively charged

Two like charges

•  neutralize each other.

• repel each other. 

• must be neutrons. 

• attract each other.

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The charge of an electron is 

• positive. 

• negative. 

• Electrons have no charge

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When a balloon is rubbed on clothes it acquires a charge by ___________

• Induction

• reduction

• friction 

• concuction

8. Consider the conduction charging shown.

• Electrons move from the insulating stand into the sphere.

• Protons move from the bar into the sphere.

• Protons move from the sphere into the negatively charged bar.

• Electrons move from the charged metal bar into the sphere.

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Milliken's Oil Drop Experiment uses which forces?

• Attractive Electrostatic force and Attractive Gravitational Force

• Repulsive Electrostatic force and Attractive Gravitational Force

• Repulsive Electrostatic force and Repulsive Gravitational Force

• Attractive Electrostatic force and Repulsive Gravitational Force

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which is the field for opposite charges

• 
• 
• 
• 

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A negatively charged plastic comb is brought close to, but does not touch, a small piece of paper. If the comb and the paper are attracted to each other, the charge on the paper

• must be positive

• must be negative

• may be neutral or negative

• may be neutral or positive 

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