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

5.

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?

 A. I
 B. II
 C. III
 D. IV
 E. V

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

7.

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 The two spheres are slightly separated and the rod is then withdrawn.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:
 A. 4:1
 B. 2:1
 C. 1:1
 D. 1:2
 E. 1:4

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

10.

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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