1. The magnitude of the charge on an electron is approximately:
A.1023 C
B.10–23 C
C.1019 C
D.10–19 C
E.109 C

2. A wire contains a steady current of 2 A. The charge that passes a cross section in 2 s is:
A.3.2 × 10–19 C
B.6.4 × 10–19 C
C.1 C
D.2 C
E.4 C

3. The charge on a glass rod which has been rubbed with silk is called positive:
A.by arbitrary convention
B.so that the proton charge will be positive
C.to conform to the conventions adopted for G and m in Newton's law of gravitation
D.because like charges repel
E.because glass is an insulator

4. An electrical insulator is a material:
A.containing no electrons
B.through which electrons do not flow easily
C.which has more electrons than protons on its surface
D.cannot be a pure chemical element
E.must be a crystal


The diagram shows two pairs of heavily charged plastic cubes. Cubes 1 and 2 attract each other and so do cubes 1 and 3.

Which of the following illustrates the forces of 2 on 3 and 3 on 2?


6. A positively charged insulating rod is brought close to an object that is suspended by a string. If the object is attracted toward the rod we can conclude:
A.the object is positively charged
B.the object is negatively charged
C.the object is an insulator
D.the object is a conductor
E.none of the above


Two uncharged metal spheres, L and M, are in contact. A negatively charged rod is brought close to L, but not touching it, as shown. The two spheres are slightly separated and the rod is then withdrawn. As a result:

A.both spheres are neutral
B.both spheres are positive
C.both spheres are negative
D.L is negative and M is positive
E.L is positive and M is negative

8. Two particles, X and Y, are 4 m apart. X has a charge of 2Q and Y has a charge of Q. The ratio of the magnitude of the electrostatic force on X to that on Y is:

9. A 5.0-C charge is 10 m from a –2.0-C charge. The electrostatic force is on the positive charge is:
A.9.0 × 108 N toward the negative charge
B.9.0 × 108 N away from the negative charge
C.9.0 × 109 N toward the negative charge
D.9.0 × 109 N away from the negative charge
E.none of these


Two protons (p1 and p2) and an eletron (e) lie on a straight line, as shown. The directions of the force of p2 on p1, the force of e on p1, and the total force on p1, respectively, are:

A.®, ¬, ®
B.¬, ®, ®
C.®, ¬, ¬
D.¬, ®, ¬
E.¬, ¬, ¬

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