Waves Practice Problem Set Worksheet Page 40
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ECHANICS
RACTICE
ROBLEM
ETS
23. (G17.3) How much kinetic energy will an electron gain (in Joules) if it falls
through a potential difference of 21,000 V in a TV picture tube?
-15
Answer: 3.4 x 10
J
24. (G17.5) How strong is the electric field between two parallel plates 5.2 mm apart
if the potential difference between them is 220 V?
4
Answer: 4.2 x 10
V/m
25. (G17.9) The work done by an external force to move a -7.50-µC charge from
-4
point a to point b is 25.0 x 10
J. If the charge was started from rest and had 4.82
-4
x 10
J of kinetic energy when it reached point b, what must be the potential
difference between point a and point b?
Answer: 269 V
26. (G17.13) What is the electric potential 15.0 cm from a 4.00-µC point charge?
5
Answer: 2.40 x 10
V
27. (G17.21) Two identical +7.5-µC point charges are initially spaced 5.5 cm from
each other. If they are released at the same instant from rest, how fast will they be
moving when they are very far away from each other? Assume they have identical
masses of 1.0 mg.
3
Answer: 3.0 x 10
m/s
Gamzon & Gregorian-Michaelsen
6/7/16
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