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Lesson 7.03 Electric Potential
Self-Check Quiz
1. Electric potential is defined as:
a. Charge per unit voltage
b. Potential energy per unit charge
c. Voltage per unit charge
d. Potential energy per unit distance
Answer: _____
2. It takes 10 J of energy to move a 2-C charge from point A to point
B. What is the potential difference between points A and B?
a. 20 V
b. 0.2 V
c. 5 V
d. None of the above
Answer: _____
3. A proton (m = 1.67*10-27 kg) is accelerated from rest through a
potential difference of 750 volts. What is its final velocity?
a. 5.4*105 m/s
b. 8*1014 m/s
c. 3.8*105 m/s
d. 3.0*105 m/s
Answer: _____
4. How much work is required to bring a 10.0
to 5.00 meters away from a point charge of -2.0
a. 7.2*10-3J
b. -7.2 *10-3J
c. -3.6*10-2 J
d. -3.6*10-3J
e. +3.6*10-2J
Answer: _____
C charge from infinity
C?
5. What is the change in potential energy of a proton as it moves from
x = 5m. to x = 2m. in a uniform electric field, which is parallel to
the positive x-axis and directed toward the origin, if the magnitude of
the electric field is 5.0*102 N/C?
a. 8.0*10-17 J
b. 2.0*10-16 J
c. 2.0*1021 J
Answer: _____
6. A proton moves 10.0 cm parallel to the direction of a uniform
electric field of strength 3.0 N/C. What is the change in electrical
potential energy?
a. 4.8*10-20 J
b. 1.6*10-20 J
c. -4.8*10-20 J
d. -1.6*10-20 J
Answer: _____
7. What will be the electric potential at a distance of 0.15 m from a
point charge of 6.0
C?
a. 5.4*104 V
b. 3.6*106 V
c. 2.4*106 V
d. 1.2*107 V
Answer: _____
8. An electron moves 0.10 m along the direction of an electric field of
a magnitude of 3.0 N/C. What is the magnitude of the potential
difference between the electron's initial and final points?
a. 4.8*10-19 V
b. 0.30 V
c. 0.03 V
d. 3.0*101 V
Answer: _____
9. A 3.0 C point charge is at the origin of a coordinate system.
Another point charge of -6.0
C is at x = 1.0. What is the electric
potential at the point where x = 0.50 m.?
a. 1.62*105 V
b. 1.08*105V
c. -1.08*105 V
d. -5.4*104 V
Answer: _____
10. An electron is released within a uniform electric field of a
magnitude of 28,000 N/C generated by two parallel plates. The plates
are separated by 4 cm. If the electron has moved across the entire gap
between the plates, what is its speed?
a. 0.26*107 m/sec
b. 0.65*107 m/sec
c. 1.73*107 m/sec
d. 1.98*107 m/sec
Answer: _____