PHY 111 College Physics II Spring 2010 Exam 02 Review Name

PHY 111 College Physics II Spring 2010 Exam 02 Review Name

PHY 111 College Physics II
Spring 2010
Exam 02 Review
Name___________________________________
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
1) Two point charges, initially 2.0 cm apart, experience a 1.0-N force. If they are moved to a new
separation of 8.0 cm, what is the electric force between them?
A) 1/4 N
B) 2.0 N
C) 4.0 N
D) 16 N
E) 1/16 N
1)
2) 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) 5.40 × 10-2 N
B) 0.158 N
C) 8.10 × 10-2 N
D) 0.189 N
E) 0.135 N
2)
3) A point charge Q = 7.00 × 10-9 C is placed at the origin of an x-y coordinate system. What is the
electric field intensity E at a distance of x = 30 cm from this charge? (Use k = 9 × 109 Nm 2/C2.)
3)
A) 500 N/C
B) 100 N/C
C) 700 N/C
D) 400 N/C
E) 600 N/C
4) A metal sphere of radius 2.0 cm carries a charge of 3.0 μC. What is the electric field 6.0 cm from the
center of the sphere?
A) 4.2 × 106 N/C
B) 9.3 × 106 N/C
C) 6.4 × 106 N/C
D) 5.7 × 106 N/C
E) 7.5 × 106 N/C
4)
5) A proton is placed in an electric field of intensity 700 N/C. What is the magnitude and direction of
the acceleration of this proton due to this field?
A) 6.71 × 1010 m/s2 opposite to the electric field
5)
B) 6.71 × 1010 m/s2 in the direction of the electric field
C) 6.71 × 109 m/s2 opposite to the electric field
D) 67.1 × 1010 m/s2 in the direction of the electric field
E) 67.1 × 1010 m/s2 opposite to the electric field
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6) An 800 V/m electric field is directed along the +x-axis. If the potential at x = 0 m is 2000 V, what is
the potential at x = 2 m?
A) 1000 V
B) 400 V
C) 600 V
D) 200 V
E) 800 V
6)
7) Three charges are placed as follows along the x- and y-axes of an xy-coordinate system: q1 = 2.00
7)
μC at x 1 = 0 m, q2 = 4.00 μC at x 2 = 3.00 m, and q3 = 6.00 μC at y = 4.00 m. What is the electric
potential energy of this system of charges?
A) -90.0 mJ
B) -94.2 mJ
C) 0 J
D) 94.2 mJ
E) 90.0 mJ
8) A 4.0-μC charge is situated at the origin of an xy-coordinate system. What is the potential
difference between the points x = 4.0 m and y = 2.0 m because of this charge?
A) 0 V
B) -9.0 × 103 V
8)
C) -36 × 103 V
D) 9.0 × 103 V
E) 36 × 103 V
Figure 20-9
9) Two point charges of magnitude +4.00 μC and +2.00 μC are placed at the opposite corners of a
rectangle as shown in Figure 20-9. What is the potential difference between points A and B?
A) -203 × 103 V
B) -22.5 × 103 V
C) +22.5 × 103 V
D) 0 V
E) +203 × 103 V
2
9)
10) The potential difference between the plates of a parallel plate capacitor is 35 V and the electric field
between the plates has a strength of 750 V/m. If the plate area is 4.0 × 10-2 m 2, what is the
10)
capacitance of this capacitor?
A) 7.6 × 10-14 F
B) 7.6 × 10-12 F
C) 7.6 × 10-10 F
D) 7.6 × 10-11 F
E) None of the other choices is correct.
11) A 6.00-μF parallel plate capacitor has a charge of +40.0 μC and -40.0 μC on each plate, respectively.
The potential energy stored in this capacitor is:
A) 123 μJ
B) 133 μJ
C) 143 μJ
D) 113 μJ
E) 103 μJ
11)
12) The resistance of a 100-cm wire of cross sectional area 2 × 10-6 m 2 is 400 Ω. What is the resistivity
of the material of this wire?
A) 8 × 10-4 Ωm
12)
B) 8 × 10-6 Ωm
C) 0.8 × 10-6 Ωm
D) 0.8 × 10-4 Ωm
E) 0.8 × 10-5 Ωm
13) The power rating of a 400 Ω resistor is 0.25 W. What is the maximum voltage?
A) 40 V
B) 30 V
C) 20 V
D) 10 V
E) 50 V
3
13)
Figure 21-3
14) A 4-Ω resistor is connected in parallel with a 12-Ω resistor and this combination is connected to a
DC power supply with voltage V as shown in Figure 21-3. If the total current in this circuit is 2 A,
what is the value of voltage V?
A) 1.5 V
B) 2 V
C) 3 V
D) 6 V
E) None of the other answers is correct.
14)
Figure 21-7
15) Three 2.0-Ω resistors are connected across the sides of an equilateral triangle ABC as shown in
Figure 21-7. What is the equivalent resistance between any two points, AB, BC, or AC, of this
circuit?
A) 3.3 Ω
B) 6.0 Ω
C) 1.3 Ω
D) 4.3 Ω
E) 2.0 Ω
4
15)
Figure 21-14
16) A number of resistors are connected across points A and B as shown in Figure 21-14. What is the
equivalent resistance between points A and B?
A) 6 Ω
B) 12 Ω
C) 8 Ω
D) 10 Ω
E) 4 Ω
16)
17) A 2.0 μF and a 4.0 μF capacitor are connected in series across an 8.0-V DC source. What is the
charge on the 2.0 μF capacitor?
A) 11 μC
B) 4.0 μC
C) 2.0 μC
D) 12 μC
E) 25 μC
17)
18) A 8.0 μF capacitor is connected in series with a 6.0 kΩ resistor across a 20-V DC source and a
switch. What is the time constant of this RC circuit?
A) 12 ms
B) 18 ms
C) 9.0 ms
D) 48 ms
E) 40 ms
18)
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Answer Key
Testname: PHY111S10REV02
1) E
2) D
3) C
4) E
5) B
6) B
7) D
8) B
9) B
10) B
11) B
12) A
13) D
14) D
15) C
16) C
17) A
18) D
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