Chapter 16 Sample Multiple Problems
1. A piece of plastic has a net charge of +2.00
μC. How many more protons
than electrons does this piece of plastic have?
a.
1.25X1013
b.
1.25X1019
c.
2.50X1013
d.
2.50X1019
2. Two charges are separated
by a distance d and exert mutual attractive forces of F on each other. If the charges are separated by a distance of d/3, what
are the new mutual forces?
a.
F/3
b.
F/9
c.
3F
d.
9F
3. A +4.0 C charge is
at the origin and a +9.0 C charge is at x = 4.0 m. Where
on the x-axis can a third charge be placed so the net force on it is zero?
a. 0.50 m from +4.0 C
b. 0.60 m from +4.0 C
c. 1.6 m from +4.0 C
d. 2.4 m from +4.0 C
4. Three point charges
are located at the following positions: Q1 =
2.00 μC at x = 1.00 m; Q2
= 3.00 μC at x = 0; Q3 = -5.00 μC at x = -1.00 m. What is
the magnitude of the force on the 3.00 μC charge?
a. 5.40X10-2
N
b.
0.135 N
c. 8.10X10-2
N
d.
0.189 N
5. Two point charges,
separated by 1.5 cm, have charge values of +2.0 and -4.0 μC, respectively. What is the
magnitude of the electric force between them?
a.
-320 N
b.
320 N
c. 3.6X10-8
N
d. 8.0X10-12
N
6. Charge +2q is placed
at the origin and charge -q is placed at x = 2a. Where
can a third positive charge +q be placed so that
the force on it is zero?
a.
3.4a
b.
6.8a
c.
8.6a
d.
9.3a
7. Is it possible for
two electrons to attract each other?
a.
Yes, they always attract.
b.
Yes, they will attract if they are close enough.
c.
Yes, they will attract if one carries a larger charge than the other.
d.
No, they will never attract.
8. Three identical point
charges of 2.0 μC are placed on the x-axis. The first charge is at the origin, the second to the right
at x = 50 cm, and the third is at the 100 cm mark. What are the magnitude and direction of the electrostatic
force which acts on the charge at the origin?
a.
0.18 N left
b.
0.18 N right
c.
0.36 N left
d.
0.36 N right
9. The force between a
0.015 C charge and a 10.3 μC charge is 0.40 N. How far apart are they?
a. 59 m
b. 39 m
c. 39 cm
d. 59 mm
10. A force of 6.0 N acts
on a charge of 3.0 μC when it is placed in a
uniform electric field. What is the magnitude of this
electric field?
a. 18 MN/C
b. 2.0 MN/C
c. 0.50 MN/C
d. 130 MN/C
11. Can electric field lines
intersect in free space?
a.
Yes, but only at the midpoint between two equal like charges.
b.
Yes, but only at the midpoint between a positive and a negative charge.
c.
Yes, but only at the centroid of an equilateral
triangle with like charges at each corner.
d. No.
12. A 5.0-C charge is 10
m from a small test charge of 1.0 nC. What is the electric
field at the 1.0 nC
charge?
a.
4.5X106 N/C
b.
4.5X107 N/C
c.
4.5X108 N/C
d.
4.5X109 N/C
13. A 5.0-C charge is 10
m from a small test charge of 1.0 nC. What is the direction
of the electric field at the 1.0 nC charge?
a. toward the 5.0 C
b. away from the 5.0
C
c. perpendicular to a
line joining the charges
d. none of the above
14. A 5.0 μC charge is placed at the 0 cm mark of a meterstick and a -4.0 μC
charge is placed at the 50 cm mark. What is the electric
field at the 30 cm mark?
a.
4.0X105 N/C
b.
5.0X105 N/C
c.
9.0X105 N/C
d.
1.4X106 N/C
15. Two point charges each
have a value of 3.0 C and are separated by a distance of 4.0 m. What is the electric field at a point midway between the
two charges?
a. zero
b.
9.0X107 N/C
c.
18X107 N/C
d.
4.5X107 N/C
Answers:
1. a
2. d
3. c
4. d
5. b
6. b
7. d
8. a
9. a
10. b
11. d
12. c
13. b
14. d
15. a