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3/17/06 Exam 2
Name____________________________________Section______________
1. Two charges +
q
and 
q
are located along the
y
axis at
y = +a
and
y = –a
, respectively, as shown.
a. On the diagram, draw and label a vector
r
E
+
that represents the electric field due to +
q
at the point (+
3
a
, 0),
as indicated by the tiny circle. Draw and label a vector
r
E
"
that represents the electric field due to –
q
at that
same point. Be sure to clearly show their directions and relative magnitudes. (2 points)
b. Find the magnitude and direction of the electric field at the point (+
3
a
, 0) in terms of any or all of the
following:
q
,
a
, and fundamental physical and mathematical constants. (12 points)
c. Now a charge
q
0
is placed at the point (+
3
a
, 0). Find the magnitude and direction of the electric force on
q
0
in terms of any or all of the following:
q
,
q
0
,
a
, and fundamental physical and mathematical constants. (2 points)
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This note was uploaded on 07/16/2008 for the course PHYS 122 taught by Professor Anderson during the Fall '07 term at UMBC.
 Fall '07
 ANDERSON
 Physics, Charge

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