Below you will find a set of 5 conceptual and numerical revision questions selected randomly from lots of questions I have put together covering the material in Chapter 23, "Electric Potential". This includes questions on the electric potential for a system of charges and for continuous charge distributions, finding the potential from the electric field and equipotential surfaces. When you have finished the quiz, click on the "Submit Quiz" button at the bottom and within seconds it will be automatically graded and the results returned to you!

To select a new set of questions click on the "Reload" or "Refresh" button on your browser. You may find some of the questions duplicated but that's the nature of a random selection. Try it a few times ... it's not fattening and you may learn something!

Many thanks to Mark Wood for producing the quiz-maker code.

Q1: A completely ionized beryllium atom (net charge = +4e) is accelerated through a potential difference of 6.0 V. What is the atom's gain in kinetic energy?

0
0.67 eV
4 eV
6 eV
24 eV

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Q2: Two parallel horizontal plates are spaced 0.40 cm apart in air. You introduce an oil droplet of mass 4.9 × 10^-17 kg between the plates. If the droplet carries two electrons and if there were no air buoyancy, you could hold the droplet motionless between the plates if you kept the potential difference between them at:

60 V
12 V
3.0 V
0.12 kV
6.0 V

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Q3: Which point in the electric field in the diagram is at the lowest potential?

1
2
3
4
5

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Q4: The figure below shows a uniform electric field.

The direction in which the increase in the electric potential is a maximum is

1
2
3
4
5

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Q5: A disk of radius 10 cm has a uniform charge density of 20 nC/cm².

A small particle of mass 10 mg and charge 5 nC is placed at x = 20 cm and released. What is the speed of the particle when it is a great distance from the disk?

14.2 cm/s
22.5 cm/s
42.9 cm/s
51.8 cm/s
66.1 cm/s

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