No Title
Physics II
Quiz 5
Tuesday 1/26/16
Name
O233: periods 1,2
CM #
Teo equal positive point charges are placed symmetrically about the origin on the x-axis. A field point is located on the y-axis.
k=8.99×10
9
N·m
2
/C
2
q=2.00
m
C
m
= 10
-
6
a=3.00 m
b=4.00 m
(a) What force does one charge exert on the other charge?
F
=
kq
2
r
2
=
(8.99×10
9
N·m
2
/C
2
)( 2.00×10
-
6
C)
2
(6.00 m)
2
=
9.99×10
-
4
N
(b) What is the direction of the net electric field at the field point P?
E
net
=E
net
^
j
(c) What is the magnitude of the net electric field at P?
E
=
kq
r
2
=
(8.99×10
9
N·m
2
/C
2
)( 2.00×10
-
6
C)
(5.00 m)
2
=
7.19×10
2
N/C
E
net
=
2Esin
q
=
2(7.19×10
2
N/C)(0.800)
=
1.15×10
3
N/C
(d) If a point charge q
¢
=
-
5.00
m
C is place at P, what force acts on it?
F
q
¢
=
q
¢
E
net
=
(
-
5.00×10
-
6
C)(1.15×10
2
N/C)
=
-
5.75×10
-
3
N
File translated from T
E
X by
T
T
H
, version 3.85.
On 25 Jan 2016, 11:52.