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Electric Potential Difference
5.10 Problems
5.1) What potential difference is
needed to stop an electron with an
initial speed of 4.2×10 5 m/s?
5.2) An ion accelerated through a
potential difference of 115V
experiences an increase in potential
energy of 7.37×10 -17 J. Calculate the
charge on the ion.
5.3) How much energy is gained by
a charge of 75 µC moving through
a potential difference of 90V?
5.4) An infinite charged sheet has a
surface charge density σ of 1.0×10 -
7 C/m 2 . How far apart are the
equipotential surfaces whose
potentials differ by 5.0 V?
5.5) At what distance from a point
charge of 8µC would the potential
equal 3.6×10 4 V?
5.6) At a distance r away from a
point charge q, the electrical
potential is V=400V and the
magnitude of the electric field is
E=150N/C. Determine the value of
q and r.
5.7) Calculate the value of the
electric potential at point P due to
the charge configuration shown in
Figure 5.19. Use the values
q 1 =5µC, q 2 =-10µC, a=0.4m, and
b=0.5m.
b
q 1
+ -
a
P
q 2
q 1 b q 2
a
+ -
Figure 5.19
5.8) Two point charges are located
as shown in Figure 5.20, where
q l =+4µC, q 2 =-2µC, a=0.30m, and
b =0.90m. Calculate the value of
the electrical potential at points P 1 ,
and P 2 . Which point is at the
higher potential?
q 1
a
q 2
b
a
-
x
P 1
P 2
b
y
+
Figure 5.20
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