2. The diagram to the right depicts the +25 V,
0 V, –25 V, and –50 V equipotentials in
the region of three +1 nC charges and a
single –3 nC charge placed between them.
a
a. Label the equipotential lines with their
appropriate voltages. You’ll need to
d
b
c
make six labels, but some will have the
same value.
b. Consider the points a, b, c, and d.
i. At which of these four points is
the electric potential highest?
Circle one and explain below.
a b c d
ii. At which of these four points is the electric potential lowest? Circle one and explain.
iii. At which of these points is the magnitude of the electric field highest? Circle one and explain.
c. On the diagram above, draw in your best approximation of the –12.5 V equipotential.
d. Calculate the electric potential at point d above. Express your answer with appropriate units.
Make sure your answer is consistent with the equipotential values given in the problem.
e. Qualitatively sketch in electric
field lines (with appropriate arrow
heads) on the diagram at left.
Let six field lines leave each of the
positive charges.
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