Physics Quiz 12 (Ch 16)

Objects become electrically charged as a result of the transfer of

• protons.

• electrons.

• neutrons.

• nuclei.

The nucleus of an atom has _____ electric charge.

• a positive

• a negative

• a neutral

• both positive or negative

Uncharged objects can be attracted by a charged object because the uncharged objects acquire a surface charge by the process of

• contact.

• polarization.

• conduction.

• charge transfer.

An electric force F exists between two objects, both having the charge q. If the charge on one object is doubled to 2q, the force between the objects becomes

• 1/4 F

• 1/2 F

• 2F

• 4F

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Electric force and gravitational force are alike in that both forces

• depend on charge.

• depend on mass.

• act only when objects are touching.

• are field forces.

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Which of the following best represents a difference between electric force and gravitational force?

• Gravitational force is stronger than electric force.

• Electric force can both attract and repel.

• Electric force is inversely proportional to the square of the distance between objects.

• Gravitational force exists between objects that are not touching.

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Which of the following units is used to state the strength of an electric field?

• coulombs per cubic meter

• coulombs per newton

• newtons per coulomb

• meters per coulomb

The strength of an electric field around a charged object depends on both the magnitude of the charge and

• the magnitude of a test charge.

• the sign of the object’s charge.

• the distance from the object.

• the volume of space around the object.

The electric fields of two charges, A and B, are represented by diagrams showing electric field lines. If charge B is greater than charge A, the diagram of charge B will have _____ than the diagram of charge A.

• more lines per unit area

• longer field lines

• straighter field lines

• more curved field lines

The diagram above shows the electric field lines around two charges that have been brought near each other. From the diagram you can infer that the charge of the left is than the charge on the right.

• negative and smaller in magnitude

• negative and larger in magnitude

• positive and smaller in magnitude

• positive and larger in magnitude

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