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Mastery Quiz
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1

When 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
2

A 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
3

If 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
4

If 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
5

Materials that allow electric charges to move freely are called
A)conductors
B)insulators
6

Materials that do not allow electric charges to move freely are called
A)conductors
B)insulators
7

Electric 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
8

The 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
9

The 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
10

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





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