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available
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What must be the distance between point charge qr:
,0 pC and point charge
ez
: 47
.0 p.C for the electrostatic
force
tween them to have a magnitudeof 5.70 N?
"S#
In the return stroke of a typical lightning bolt, a current
2.5 x 101A exists for 20 ps. How much charge is transferred in
lhis event?
A particle of charge +3.00 x 106 C is 12.0 cm distant from a
lecond particle of charge
1.50
x 106 C. Calculate the magni
lucle of the electrostaticforce between the particles.
r$
llw
Two equally charged particles are held 3.2 x 103m
Irllirrt and then released
from rest. The initial acceleration of the
lirst particle is observed
to be 7.0 m/s2 and that of the second to
he
t).0
m/sr. If the mass of the first particle is 6.3 x 107 kg, what
ture
(a) the mass of the second particle and (b) the magnitude of
lhe charge of each particle?
,'7
In Fig. 2122,
three charged particlcs lie on an x axis.
particles
I :rnd 2 are fixed in place. Particle 3 is free to move, but the net
,
Lt:#
1z:4
Additional information available
in The Flying Circus otf Physics and at flyingcircusofphysics.com
214 Coulomb's Law
WryYV Workedout
solution
is at
ILW
Interactive
solution
is at
electrostatic force on it from parti
cles 1 and 2 happens to be zero. If
Lzt
:
L,r. what is the ratio q1lq2?
..8
In Fig. 2I23, three identical
conducting spheres initially have
the following charges:
sphere A, 4Q;
sphere B,
6Q;
and sphere C, 0.
Spheres A and B are fixed in placc,
with a centertocenter separation
that is much larger than the spheres.
1..S
l
i

l
Two experiments are conducted. In experiment 1, sphere C is
touched to sphere A and then (separately) to sphere .8, and then it is
removed. In experirnent2, starting with the same initial states,
the
procedure is reversed: Sphere C is touched to sphere B and then
(separately) to sphere A, and then it is removed. What is the ratio of
the electrostatic force between A and ^B at the end of experiment 2 to
that at the end of experiment 1?
..9
SSM w\,vw
Two identical conducting spheres, fixed in
place,attract each other with an electrostaticforce of 0.108 N when
their centertocenter separation is 50.0 cm. The spheres are then
connected by a thin conducting wire. When the wire is removed,
the spheres
repel each other with an electrostatic
force of 0.0360N.
Of the initial charges on the spheres,
with a positive net charge, what was (a)
the negative charge on one of them
and (b) the positive charge on the
other?
..10
S
In Fig. 2I24, four particles
form a square. The charges are q1:
eq: Q
and q2:
e3:
q. (a) What is
Qlq
if the net electrostatic force on
particles 1 and 4 is zero? (b) Is there
any value of q that makes the net elec
trostatic force on each of the four parti
[  r 
 ]
l
Fig 2125
Problems
13. 19,30.58.
and 67.
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 Fall '09
 Work, Trigraph, Fig, hat, nd, lectrostatic f orce

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