Practice Problems
Basic Electrostatics
Directions:
On this worksheet ...
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Question 1
Who originally named the electric charges?
Benjamin Franklin
Henri Cavendish
J. J. Thomson
Charles Coulomb
Ernest Rutherford
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Question 2
A nonconductor is charged and then brought near a conductor. Consequently
the two electrostatically repel each other
the two electrostatically attract each other
the conductor is neutralized
there is no electrostatic interaction at all
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Question 3
If the charge on each of two identical tiny spheres is changed to a value that represents a factor of 2 times their original charge while their separation is decreased to a distance that represents a factor of 1/8 their original separation, what will be the new force of interaction?
32 times as strong
256 times as strong
0.0312 times as strong
0.0625 times as strong
0.0039 times as strong
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Question 4
By roughly how much does the mass of a copper object change when, upon being stroked with a piece of woolen cloth, it acquires an excess charge of -2 µC?
1.37 x 10
43
kg
1.14 x 10
-11
kg
1.14 x 10
-17
kg
1.37 x 10
49
kg
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Question 5
Which of the following statements is NOT true when comparing electrical forces and gravitational forces?
both forces can be repulsive
when two electrons are in close proximity,
the gravitational force between them is
smaller than the electrical force between them
both forces can be attractive
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Question 6
Which of the following demonstrations was not a result of charge polarization?
tiny pieces of paper confetti being 'scattered' by a charged balloon
a charged balloon sticking to a ceiling tile
a charged balloon discharging through a metal handle
a water stream 'bending' towards a charged balloon
a wooden stick being rotated on the watch glass by a charged balloon
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Question 7
Two isolated charges, +q and -2q, are 2 centimeters apart. If F is the magnitude of the force acting on charge -2q, what are the magnitude and direction of the force acting on charge +q?
F away from charge -2q
0.5 F away from charge -2q
0.5 F towards charge -2q
F towards charge -2q
2F towards charge -2q
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Question 8
Two identical, positive point charges repel each other with force 0.36 N when their separation is 1.9 m. How large is each charge?
3.33 x 10
-6
C
1.2 x 10
-5
C
8.72 x 10
-6
C
1.08 x 10
5
C
1.44 x 10
-10
C
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Question 9
Which of the following statements is NOT true when comparing electroscopes charged by induction and conduction?
the scope charged by conduction will have
the same charge as the charging rod
both scopes will have the same charge
as the charging rod
the scope charged by induction will have
the opposite charge as the charging rod
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