Waves Practice Problem Set Worksheet Page 38
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47M
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P
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35
ECHANICS
RACTICE
ROBLEM
ETS
Unit 10
C
, F
, C
P
DC C
HARGE
IELDS
URRENT
OTENTIAL AND
IRCUITS
10.1
C
’
L
OULOMB
S
AW
1. What is the magnitude of the force of a 10.0-µC charge on a 3.0-µC charge 2.0 m
away?
Answer: 0.068 N
-12
2. How far apart must two electrons be if the force between them is 2.0 x 10
N?
-8
Answer: 1.1 x 10
m
-9
-9
3. A +2.2 X 10
C charge is on the x-axis at x= -1.5 m and a +5.4 x 10
C charge is
-9
on the x-axis at x= 2.0 m. Find the net force exerted on a +3.5 x 10
C located at
the origin?
-8
Answer: 1.2 x 10
N to the left
4. Three charges are shown in the figure below. Find the magnitude and direction of
13.
Three charges are shown in the figure below. Find the magnitude an dire
the electrostatic force at the 5-nC charge.
-5
Answer: 1.4 x 10
N
the electrostatic force of the 5 nC charge.
at 257.5°
-10
5. A fly accumulates 3.0 x 10
C of positive charge as it flies through the air. It
settles on a leave. What is the magnitude and direction of the electric field at a
location 2.0 cm away from the fly?
Answer: 6750 N/C
6. When a TV set is turned on to watch cartoons, an electron beam in the TV tube is
steered across the screen by an electric field between two charged plates. If an
-6
electron experiences a force of 3.0 x 10
N, how large is the field between the
deflection plates?
13
Answer: 1.9 x 10
N/C
7. A tiny ball with a mass of 0.012 kg carries a charge of -18-µC. What is the
magnitude and direction of the electric field needed to cause the ball to float
above the ground?
Answer: 6533 N/C downward
14.
Three charges are shown below. Find the magnitude and direction of the
electrostatic force on the 6 nC charge.
8. A charged particle of +12 nC is located 0.10 m to the left of another charged
particle of -12 nC. What is the net electric field at a point that is located between
the two charges at a distance of 6.0 cm to the right of the positive charge?
4
Answer: 9.8 x 10
N/C to the right
a. What is the net electric field at a point that is located 4.0 cm to the left of
the positive charge?
4
Answer: 6.2 x 10
N/C to the left
-4
9. What is the electric potential 0.50 m away from a 4.5 x 10
C point charge?
6
Answer: 8.1 x 10
V
Gamzon & Gregorian-Michaelsen
6/7/16
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