Waves Practice Problem Set Worksheet Page 39
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ECHANICS
RACTICE
ROBLEM
ETS
10. How much energy is acquired by an electron in moving through a potential
4
difference of 2.5 x 10
V?
-15
Answer: 4.0 x 10
J
11. How far apart are two parallel plates if a potential difference of 600 V produces
4
an electric field intensity of 1.2 x 10
N/C between them?
Answer: 0.05 m
12. What is the speed of an electron that has been accelerated from rest through a
potential difference of 80.0 kV?
-31
The mass of an electron is 9.11 x 10
kg.
8
Answer: 1.7 x 10
m/s
(G16.3) Two charged balls are 20.0 cm apart. They are moved, and the force on
13.
each of them is found to have been tripled. How far apart are they now?
Answer: 11.5 cm
(G16.5) What is the magnitude of the attractive electric force between an iron
14.
nucleus (q = +26e) and its innermost electron if the distance between them is 1.5
-12
x 10
m?
-3
Answer: 2.7 x 10
N
15. (G16.7) What is the magnitude of the force a +15-µC charge exerts on a +3.0-mC
-6
-3
charge 40 cm away? (1-µC = 1 x 10
C, 1-mC = 1 x 10
C)
3
Answer: 2.5 x 10
N
(G16.11) Three particles, Q
= +70 µC, Q
= +48 µC, and Q
= -80 µC, are
16.
1
2
3
placed in a line as shown. The center one is 0.35 m from each of the others.
Calculate the net force on each charge due to the other two.
2
Answer: -1.4 x 10
N
2
+ 5.3 x 10
N
2
-3.9 x 10
N
17. (G16.13) A charge of 6.00 mC is placed at each corner of a square 1.00 m on a
side. Determine the magnitude and direction of the force on each charge.
5
Answer: 6.20 x 10
N away from the square’s center
18. (G16.23) A proton is released in a uniform electric field and it experiences an
-14
electric force of 3.2 x 10
N toward the south. What are the magnitude and
direction of the electric field?
5
Answer: + 2.0 x 10
N/C south
19. (G16.25) What is the magnitude and direction of the electric field 30.0 cm
-6
directly above a 33.0 x 10
C charge?
6
Answer: + 3.30 x 10
N/C up
20. (G16.27) An electron is released from rest in a uniform electric field and
2
accelerates to the north at a rate of 125 m/s
. What is the magnitude and direction
of the electric field?
-10
Answer: 7.12 x 10
N/C south
21. (G16.31) Calculate the electric field at one corner of a square 1.00 m on a side if
-6
the other three corners are occupied by 2.80 x 10
C charges.
6
Answer: 3.80 x 10
N/C away from the positive charge
22. (G17.1) How much work is needed to move an -8.6 µC charge from the ground to
a point whose potential is +75 V?
-4
Answer: -6.5 x 10
J
Gamzon & Gregorian-Michaelsen
6/7/16
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