Static Electricity
Practice Test
1.
What are the two kinds of electrical charges?
a.
high and low
b.
destructive and constructive
c.
positive and negative
d.
static and dynamic
Hint
2.
The best explanation for why the phenomenon in Figure 20-1 occurs is ____.
a.
the same electrical charges on the ruler and paper bits are attracted to each other.
b.
the paper bits are magnetically attracted to the ruler.
c.
the opposite electrical charges on the ruler and paper bits are attracted to each other.
d.
the paper bits are gravitationally attracted to the ruler.
Hint
3.
In Figure 20-11b, if
q
<
1
is 3.0 mC,
q
2
is -7.0 mC, and the separation between them is 3.0 m, what is the magnitude of the force between them?
a.
43,000 N
b.
63,000 N
c.
7200 N
d.
21,000 N
Hint
4.
In Figure 20-8, if the charge on the rod were positive, what effect, if any, would this have on the final result?
a.
The left sphere would be negatively charged and the right sphere would be positively charged, with the same amount of charge as in the original picture c.
b.
The left sphere would still be positive and the right sphere would still be negative, but there would be more total charge on each.
c.
The left sphere would still be positive and the right sphere would still be negative, but there would be less total charge on each.
d.
It would have no effect.
Hint
