PHY2061
R. D. Field
Problems
Chapter 26
Page 1 of 6
Q1
L/3
L
Q2
P
Chapter 26 Problems
Problem 1:
What is the magnitude (
in milliN
) and direction of the electrostatic force on
a
2.0 microC
charge in a uniform electric field given by
x
C
N
E
°
)
/
100
(
=
r
?
Problem 2:
Two point charges,
+8 nanoC
and
2
nanoC
lie on the xaxis and are separated
by
6 meters
as shown in the
Figure
. What
is the magnitude of the electric field (
in N/C
) at a point
P
on the xaxis a
distance of
6 meters
to the right of the negative charge?
Problem 3:
Two charges
Q
1
and
Q
2
are separated by
distance
L
and lie on the xaxis with
Q
1
at the
origin as shown in the
figure
.
At a point
P
on
the xaxis a distance
L/3
from
Q
1
the
net
electric field is zero.
What is the
ratio
Q
1
/Q
2
?
Problem 4:
A particle with a charge to mass ratio of
0.1 C/kg
starts from rest in a
uniform electric field with magnitude,
E = 10 N/C
.
How far will the
particle move (
in m
) in
2 seconds
?
Problem 5:
A large insulating sheet carries a uniform surface charge of density
1.2 microC/m
2
.
A proton (with a mass of
1.67x10
27
kg
) is released from
rest at perpendicular distance of
1.0 m
from the sheet.
How much time (
in
microsec
) elapses before the proton strikes the sheet?
6 m
6 m
2 nC
P
+8 nC
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PHY2061
R. D. Field
Problems
Chapter 26
Page 2 of 6
Problem 6:
At a distance of
1 meter
from an isolated point charge the electric field
strength is
100 N/C
.
At what distance (
in m
) from the charge is the electric
field strength equal to
50 N/C
?
Problem 7:
The magnitude of the electric field
300 m
from a point charge
Q
is equal to
1,000 N/C
.
What is the charge
Q
(
in C
)?
Problem 8:
A neon sign includes a long neonfilled glass tube with electrodes at each
end across which an electric field of
20,000 N/C
. is placed.
This large field
accelerates free electrons which collide with and ionize a portion of the
neon atoms which emit red light as they recombine. Assuming that some of
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 Spring '08
 FRY
 Physics, Charge, Electrostatics, Force, Electric charge, Fundamental physics concepts, R. D. Field

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