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16. (a) For the net force to be in the +
x
direction, the
y
components of the individual
forces must cancel. The angle of the force exerted by the
q
1
=
40
µ
C charge on
3
20
qC
=
is 45°, and the angle of force exerted on
q
3
by
Q
is at –
θ
where
=
F
H
G
I
K
J
=°
−
tan
.
.
..
1
20
30
337
Therefore, cancellation of
y
components requires
()
( )
13
3
22

sin 45
sin
0.02 2
(0.030)
(0.020)
qq
Q q
kk
°=
+
from which we obtain 
Q
 = 83
C. Charge
Q
is “pulling” on
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This note was uploaded on 09/06/2009 for the course PHYSICS 14358 taught by Professor Bolton during the Spring '09 term at Kansas State University.
 Spring '09
 Bolton
 Charge, Force

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