30. As the distance between two charges increases, the electric potential energy of the two-charge system... always increases. always decreases. increases if the charges have the same sign. a) b) c) d) increases if the charges have opposite sign. is always negative.
30. As the distance between two charges increases, the electric potential energy of the two-charge system... always increases. always decreases. increases if the charges have the same sign. a) b) c) d) increases if the charges have opposite sign. is always negative.
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Transcribed Image Text:b)
exactly zero.
c)
directed toward the negative charge.
d)
stronger than the electric field at the surface of the conductor.
e)
none of these
30. As the distance between two charges increases, the electric potential energy of the
two-charge system...
always increases.
always decreases.
increases if the charges have the same sign.
increases if the charges have opposite sign.
a)
b)
e)
is always negative.
31. You observe diffraction in a ripple tank (see
diagram). To increase the diffraction of the
waves in the region beyond the barrier, you
consider the following adjustments:
i)
barmier
decreasing the width of the opening
ii) decreasing the depth of the water
iii) decreasing the frequency of the source
wave generator
The best adius
nents is
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