Download Motion in One Dimension

NAME ____________________________ DATE ________________ CLASS __________________
Electrical Energy and Current
Problem A
1.What is the potential difference between a point 0.48 mm from a charge of
2.9 nC and a point at infinity?
2.The potential energy of an electron (q = 1.6  1019 C) increases by
3.3  1015 J when it moves 3.5 cm parallel to a uniform electric field. What
is the magnitude of the electric field through which the electron passes?
3. A charged particle gains 3.1  1012 J of potential energy when it moves
4.7 cm through a uniform electric field. The potential difference across this
distance is 73 V.
a. What is the magnitude of the electric field?
b. What is the magnitude of the charge on the particle?
4. A charged particle moves through a distance of 9.35 m parallel to a uniform
electric field. The electrical potential energy of the particle increases by
3.17  1010 J as it moves. The electric field has a magnitude of
1.25  105 N/C.
a. What is the charge on the particle?
b. What is the potential difference between the starting and final positions?
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Problem Workbook
5.There is an electric field close to the surface of Earth. This field points toward
the surface and has a magnitude of about 1.5  102 N/C. A charge moves
perpendicularly toward the surface of Earth through a distance of 439 m, the
height of the Sears Tower in Chicago, Illinois. During this trip, the electric
potential energy of the charge decreases by 3.7  108 J.
a. What is the charge on the moving particle?
b. What is the potential difference between the top of the Sears Tower and
the ground?
c. What is the electric potential of the charge at its final position?
6. Two parallel plates are separated by a distance of 0.077 cm. Between the
plates is a uniform electric field having a magnitude of 6.5  102 N/C. What is
the magnitude of the potential difference between the plates?
7. A proton (q = 1.6  1019 C) moves 3.75 m in the direction of a uniform
electric field having a field strength of 383 N/C.
a. What is the magnitude of the potential difference between the initial and
final positions of the proton?
b. What is the change in the electrical potential energy of the proton?
8. A charged oil droplet gains 1.9 × 10-19 J of electrical potential energy while
moving 3.0 cm in a uniform electric field. What is the charge on the droplet if
the strength of the electric field is 2.0 × 104 N/C?
9. The Eiffel Tower has a height of 0.30 km. Suppose the atmospheric electric
field of the Earth at the Eiffel Tower is 95 N/C directed downward. What is
the electric potential difference between the ground and the tip of the Eiffel
Tower?
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Holt Physics
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Problem Workbook
NAME ____________________________ DATE ________________ CLASS __________________
10. Cars start by generating a 3.0 × 106 N/C electric field that causes a spark to
cross a gap in a spark plug. The gap of a standard spark plug is 6.25 × 10-4 m.
What minimum potential difference must be applied across a standard spark
plug to start the car?
11. Two charged plates separated by 15 cm create a uniform electric field of 360
N/C. What is the potential difference between the plates?
12. An electron (q = −1.6 × 10-19 C) has an electrical potential energy of 1.1 × 1018
J in an electric field. What is the electric potential at that point in the field?
13. What is the electric potential at a point where an alpha particle (q = 3.2 × 10-19
C) has an electrical potential energy of 3.5 × 10−17 J?
14. Two charged plates separated by 4.0 cm create a uniform electric field of 3.0 ×
102 N/C. The electric potential at one of the plates is 6.0 V. What is the electric
potential at the other plate?
.
Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.
Holt Physics
141
Problem Workbook