PHYSICS 6B
Ch.17 Worksheet
www.clas.ucsb.edu/staff/vince/
1)
Find the magnitude of the electric force between two 1.00C charges
separated by 1.00m.
N
10
9
)
m
1
(
)
C
1
)(
C
1
)(
10
9
(
R
Q
kQ
F
9
2
C
m
N
9
2
2
1
elec
2
2
2)
A charge q
1
= 5.4 μC is at the origin, and a charge q
2
= 2.2 μC is on
the x axis at x=1.00. Find the net force acting on a charge q
3
= 1.6 μC
located at x = 0.75m
3)
An electron and a proton, initially separated by a distance d, are released
from rest simultaneously. The two particles are free to move. When they
collide, are they (a) at the midpoint of their initial separation, (b) closer to
the initial position of the proton, or (c) closer to the initial position of the
electron?
Answer (b) – the forces are equal magnitude, so the acceleration of the proton is much
slower due its larger mass.
So the electron moves much faster, putting the collision nearer
to the proton’s initial position.
4)
A charge –q is to be placed at either point A or point B in the figure
below. Assume points A and B lie on a line that is midway between the two
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 Spring '11
 Staff
 Charge, Force, Work, Electric charge, net force

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