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Mastery Quiz
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1When a glass rod rubbed with silk acquires a positive charge, the silk acquires
A)a positive charge
B)a negative charge
C)no charge
D)it is impossible to tell which sign of charge it acquires



2A rod with a positive charge is brought near a positively charged pith ball. The pith ball is suspended from an insulating string. The pith ball
A)will be attracted by the rod
B)will be repelled by the rod
C)will not be affected by the rod



3If the distance between two point charges is doubled while the size of the charges remains the same, the force between the charges is multiplied by
A)4
B)2
C)0.5
D)0.25



4If the distance between two point charges remains constant while the size of one of the charges is doubled, the force between the charges is multiplied by
A)4
B)2
C)0.5
D)0.25



5Materials that allow electric charges to move freely are called
A)conductors
B)insulators



6Materials that do not allow electric charges to move freely are called
A)conductors
B)insulators



7Electric field is calculated as
A)the Coulomb force divided by the size of the test charge
B)the Coulomb force multiplied by the size of the test charge
C)the Coulomb force times the size of the test charge times the distance through which the charge moves



8The increase in electrical potential energy is calculated as
A)the product of electric field and the size of the charge
B)the quotient of the electric field divided by the charge
C)the product of the electric field times the charge times the distance the charge moves in the electric field



9The change in electric potential is equal to the
A)electric field
B)Coulomb force times the size of the electric charge
C)the change in electrostatic energy divided by the size of the charge



10The unit for electric potential is
A)Coulomb
B)Newton/ meter
C)Newton/Coulomb
D)Volt







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