Worksheet
Electric Potential Drill: Point Charges
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What does a volt measure?
What is the definition of the absolute potential at infinity?
For a charged conducting sphere, how do the graphs of E vs r and V
_{abs}
vs r compare?
How do field lines indicate where the strength of a field is greatest?
How do equipotential surfaces indicate where the strength of a field is greatest?
What two combinations of units can be used to measure an electric field's strength?
At what angle do equipotential surfaces meet field lines?
Refer to the following information for the next five questions.
Positions A, B, and C are spaced equally: r
_{C}
= 3r
_{A}
.
How do the absolute potentials numerically compare between points B and C?
If a positive test charge moves in the direction of a field line, does its EPE
increase
decrease
Two test charges are brought from infinity into the vicinity of a sphere of charge +Q. The first test charge, +q, is brought to point A; the second test charge, +2q, is also brought to point A. Compared with the electrostatic potential of +q, the electrostatic potential of +2q is
smaller
the same
greater
Two test charges are brought from infinity into the vicinity of a sphere of charge +Q. The first test charge, +q, is brought to point A; the second test charge, +2q, is brought to point B. Compared with the electrostatic potential energy of the +q test charge at A, the electrostatic potential energy of the +2q test charge at B is
smaller
the same
greater
Two test charges are brought from infinity into the vicinity of a sphere of charge +Q. The first test charge, +q, is brought to point B; the second test charge, -q, is also brought to point B. Compared with the electrostatic potential energy of the +q test charge at B, the electrostatic potential energy of the -q test charge at B is
smaller
the same
greater
Refer to the following information for the next three questions.
Let the distance between each set of charges equal 2r.
In which charge group(s) is the voltage at the midpoint equal to zero?
A
B
C
D
How much work would be required to move a proton from infinity and place it on the midpoint of group B?
How much work would be required to move a proton from infinity and place it on the midpoint of group D?
In which charge configuration are both net E and net V nonzero at the center of the equilateral triangle?
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