Introduction to Electrostatics

Negative charge is formed when there is an excess amount of

• Electrons
• Neutrons
• Protons

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Opposite charges ______ each other

• Attract
• Repel
• Do nothing

In an electrically neutral object, what must be true about the numbers of protons and electrons?

• They are equal
• There are more protons than electrons
• The protons and and neutrons must be equal
• There are more electrons than protons

An electron is near two opposite charged sheets of metal.  The electron is _____  the positive sheet and ____ the negative sheet.

• attracted to / repelled by
• attracted to / attracted to
• repelled by / attracted to
• repelled by / repelled by

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When is the electrostatic force between two charges the strongest?

• When charges are very close to each other
• When charges are very far apart from each other
• When the electric field is constant

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If a negatively charged rod touches a conductor, the conductor will be charged by what method? 

• Friction
• Conduction
• Induction
• Convection

Which of these is the best definition of polarization?

• The object gains a positive or negative charge from another object.
• The charges in a neutral object separate due to a nearby charged object.
• Charges on a neutral object jump off onto a charged object due to attraction of opposite charges.
• Two objects attract each other because they are both charged.

The electrons in a certain material are closely bound to their atoms and cannot move around very much.  This material would be an electric _____.

• Conductor
• Diode
• Insulator
• Polarizer

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Two storm clouds rub against each other giving one cloud a positive charge and one a negative charge.  This is an example of charging by

• Conduction
• Convection
• Friction
• Induction

A charged balloon is brought near an electroscope but DOES NOT touch the electroscope.  This is an example of charging by

• Conduction
• Convection
• Friction
• Induction

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