PHY2044 - PHYSICS FOR ENGINEERS II
PRACTICE TEST FOR CHAPTER 21

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 21, "The Electric Field I: Discrete Charge Distributions". This includes questions on charges, conductors and insulators, Coulomb's Law, electric field and electric dipoles. 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: All macroscopic charges Q can be written as Q= +ne, where n is an integer and e is the charge of an electron.

True
False

Q2: If an object is determined to have a negative charge of 160 nC, you can conclude that the object has an excess of

109 electrons
1010 electrons
1011 electrons
1012 electrons
1013 electrons

Q3: An aluminum nail has an excess charge of +3.2 μC. How many electrons must be added to the nail to make it electrically neutral?

2.0 × 1013
2.0 × 1019
3.2 × 10-6
3.2 × 106
5.0 × 10-14

Q4: Two charges of the same magnitude and sign are placed a certain distance apart. There is only one point in space near them where the electric field is zero. Which, if any, of the following statements about that point is true?

It cannot be on the line joining the charges.
It must be on the line joining the charges and between the charges.
It must be on the line joining the charges but not between the charges.
Its position depends on the size of the charges.

Q5: A negative charge that is free to move but is at rest in an electric field E will

accelerate in a direction perpendicular to E.
remain at rest.
accelerate in a direction opposite to E.
accelerate in the same direction as E.
do none of the above.

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