Golshani (ag5873) – Homework 04 – Yao – (57045)
1
This
printout
should
have
15
questions.
Multiplechoice questions may continue on
the next column or page – find all choices
before answering.
001
10.0 points
Two uncharged metal balls,
X
and
Z
, stand
on insulating glass rods. A third ball, carrying
a positive charge, is brought near the ball
Z
as shown in the figure. A conducting wire is
then run between
X
and
Z
and then removed.
Finally the third ball is removed.
Z
X
+
conducting wire
When all this is finished
1.
ball
X
is positive and ball
Z
is negative.
2.
ball
X
is neutral and ball
Z
is negative.
3.
balls
X
and
Z
are both positive.
4.
balls
X
and
Z
are still uncharged.
5.
ball
X
is neutral and ball
Z
is positive.
6.
balls
X
and
Z
are both negative, but ball
Z
carries more charge than ball
X
.
7.
ball
X
is negative and ball
Z
is neutral.
8.
ball
X
is negative and ball
Z
is positive.
9.
ball
X
is positive and ball
Z
is neutral.
10.
balls
X
and
Z
are both negative, but ball
X
carries more charge than ball
Z
.
002
10.0 points
A strong lightning bolt transfers about 23 C
to Earth.
How many electrons are transferred?
The
charge on an electron is
−
1
.
60218
×
10
−
19
C.
003
(part 1 of 2) 10.0 points
Three pointcharges (+
q
, +
q
, and +
q
) are
placed at the vertices of an equilateral triangle
(see figure below).
a
60
◦
+
q
+
q
+
q
ˆ
ı
ˆ
The magnitude of the electric force on the
charge at the bottom lefthand vertex of the
triangle due to the other two charges is given
by
1.
bardbl
vector
F
bardbl
=
1
√
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 Fall '10
 YAO
 Electric charge, 2 K, 1 K, 2 cm, 3 k, N/C

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