Exam
Name___________________________________
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
Figure 19-3
1) Four point charges of equal magnitude but with varying signs are arranged on three of the corners and at the
center of the square of side d as shown in Figure 19-3. Which of the arrows shown represents the net force
acting on the center charge?
A) A
B) B
C) C
D) D
Figure 19-10
2) Four point charges of varying magnitude and sign are arranged on the corners of the square of side d as shown
in Figure 19-10. Which of the arrows shown represents the net force acting on the point charge with a charge
+Q?
A) A
B) B
C) C
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D) D
3) The force of attraction between a -40.0 mC and +108 mC charge is 4.00 N. What is the separation between these
two charges?
A) 2.49 m
B) 3.12 m
C) 1.13 m
D) 3.67 m
4) Two point charges of +7.00 mC and +10.0 mC are placed inside a cube of edge length 0.100 m. The net electric
flux due to these charges is given by
A) 1.92 ˛ 106 Nm 2 /C
B) 3.80 ˛ 106 Nm 2 /C
C) 0.450 ˛ 106 Nm 2 /C
D) 0.340 ˛ 106 Nm 2 /C
Figure 20-3
5) Four equal point charges of magnitude 6.00 mC and of varying signs are placed at the corners of a square 2.00 m
on each side, as shown in Figure 20-3. What is the electric potential at the center of the square?
A) 152.7 kV
B) 61.0 kV
C) 0 V
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D) 76.4 kV
Figure 20-12
6) The equipotential surfaces between two spherical conductors are shown in Figure 20-12, with the value of the
potential marked for each line. What is the potential difference between points G and D?
A) 0 V
B) +160 V
C) -160 V
D) None of the other choices is correct.
7) A capacitor consists of a set of two parallel plates of area A separated by a distance d. This capacitor is
connected to a battery and charged until its plates carry charges +Q and -Q. If the separation between the
plates is doubled, the electrical energy stored in the capacitor will
A) double.
B) be cut in half.
C) quadruple.
D) not change.
8) The resistance of a 100-cm wire of cross sectional area 2 ˛ 10-6 m 2 is 350 W. What is the resistivity of the
material of this wire?
A) 0.7 ˛ 10-6 Wm
B) 0.7 ˛ 10-4 Wm
C) 7 ˛ 10-6 Wm
D) 7 ˛ 10-4 Wm
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Figure 21-4
9) Three resistors of values 2 W, 6 W and 12 W are connected across a 2.0-V DC voltage source as shown in Figure
21-4. What is the total current I flowing this circuit?
A) 6.0 A
B) 3.0 A
C) 1.5 A
D) 0.70 A
Figure 21-7
10) A number of resistors are connected across points A and B as shown in Figure 21-7. What is the equivalent
resistance between points A and B?
A) 12 W
B) 6 W
C) 10 W
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D) 8 W
Figure 21-16
11) A system of capacitors is connected across a 90 V DC voltage source as shown in Figure 21-16. What is the
equivalent capacitance of this system?
A) 3.3 mF
B) 15 mF
C) 3.6 mF
D) None of the other answers is correct.
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Answer Key
Testname: PROLEMSDAY-BEFORE EXAM1.TST
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
1)
2)
3)
4)
5)
6)
7)
8)
9)
10)
11)
B
A
B
A
C
C
A
D
C
D
A
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