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4/30/13 chapter 15 for credit
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Current Score : 24 / 28 Due : Tuesday, January 15 2013 11:59 PM EST
1. 1/1 points | Previous Answers SerCP9 15.P.002.
A charged particle A exerts a force of 2.75 μN to the right on charged particle B when the particlesare 14.0 mm apart. Particle B moves straight away from A to make the distance between them16.9 mm. What vector force does particle B then exert on A?1.887 1.89 μN to the left
chapter 15 for credit (Homework)
Dyamond SantiagoCollege Physics II Dr. Boucher Spring 2013, Spring 2013Instructor: Derrick Boucher
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2. 0/2 points | Previous Answers SerCP9 15.P.004.
A small sphere of mass m = 6.50 g and charge q1 = 27.0 nC is attached to the end of a string and
hangs vertically as in the figure. A second charge of equal mass and charge q2 = −58.0 nC is
located below the first charge a distance d = 2.00 cm below the first charge as in the figure.
(a) Find the tension in the string.0.00352 0.0989 Your response differs significantly from the correct answer. Rework your solution from thebeginning and check each step carefully. N
(b) If the string can withstand a maximum tension of 0.180 N, what is the smallest valued can have before the string breaks?(No Response) 1.1 cm
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3. 3/3 points | Previous Answers SerCP9 15.P.018.
(a) Determine the electric field strength at a point 1.00 cm to the left of the middle charge shown
in the figure below.
20000000 2.00e+07 N/C
(b) If a charge of −3.80 μC is placed at this point, what are the magnitude and direction of theforce on it?
magnitude 76 76 N
direction toward the left toward the left
4. 4/4 points | Previous Answers SerCP9 15.P.023.MI.FB.
A proton accelerates from rest in a uniform electric field of 634 N/C. At some later time, its speed
is 1.14 106 m/s.
(a) Find the magnitude of the acceleration of the proton.
60633592349 6.07e+10 m/s2
(b) How long does it take the proton to reach this speed?
18.8 18.8 µs
(c) How far has it moved in that interval?
10.72 10.7 m
(d) What is its kinetic energy at the later time?
1.085E-15 1.09e-15 J
4/30/13 chapter 15 for credit
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5. 3/4 points | Previous Answers sercp9 15.p.024.nva
(a) Three point charges, A = 2.2 µC, B = 7.5 µC, and C = -3.9 µC, are located at the corners of anequilateral triangle as in the figure above. Find the magnitude and direction of the electric field at
the position of the 2.2 µC charge.
magnitude 230000 2.34e+05 N/C
direction
89 271 Your response differs from the correct answer by more than 10%. Double check your
calculations.° (counterclockwise from the +x-axis)
(b) How would the electric field at that point be affected if the charge there were doubled?
(c) Would the magnitude of the electric force be affected?
6. 8/8 points | Previous Answers SerCP9 15.P.035.
Refer to the figure below. The charge lowered into the center of the hollow conductor has a
magnitude of 2 µC. Find the magnitude and sign of the charge on the inside and outside of the
hollow conductor when the charge is as shown in the following images:
The magnitude of the field would be halved.
The field would be unchanged.
The magnitude of the field would double.
The magnitude of the field would quadruple.
no
yes
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(a) Figure (a)
Inside: 0 0 µC
Outside: 0 0 µC
(b) Figure (b)
Inside: 2 2 µC
Outside: -2 -2 µC
(c) Figure (c)
Inside: 0 0 µC
Outside: -2 -2 µC
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(d) Figure (d)
Inside: 0 0 µC
Outside: -2 -2 µC
7. 2/2 points | Previous Answers SerCP9 15.P.044.
A charge q = +7.20 µC is located at the center of a regular tetrahedron (a four-sided surface) asin figure below.
(a) Find the total electric flux through the tetrahedron.
813174.53 8.14e+05 N · m2/C
(b) Find the electric flux through one face of the tetrahedron.
203293.6 2.03e+05 N · m2/C
8. 2/2 points | Previous Answers SerCP9 15.P.045.soln.
A point charge q is located at the center of a spherical shell of radius a that has a charge -quniformly distributed on its surface.
Find the electric field for the following points:
(a) for all points outside the spherical shell
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(b) for a point inside the shell a distance r from the center
Solution or ExplanationNote the values in this solution reflect those of the text book question, not the values you mayhave received for this question above.
none of these
E = 0
E = q/4πr2
E = kq/r2
E = kq2/r2
E = kq/r2
E = kq2/r2
E = 0
E = q/4πr2
none of these
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9. 1/1 points | Previous Answers SerCP9 15.P.052.MI.FB.
A small plastic ball of mass m = 1.50 g is suspended by a string of length L = 21.0 cm in auniform electric field, as shown in the figure below. If the ball is in equilibrium when the stringmakes a θ = 14.5° angle with the vertical as indicated, what is the net charge on the ball?3.8 3.8 µC
10.0/1 points | Previous Answers SerCP9 15.P.062.
Three identical point charges, each of mass m = 0.350 kg, hang from three strings, as shown inthe figure below. If the lengths of the left and right strings are each L = 30.0 cm, and if the angleθ is 45.0°, determine the value of q.q = 8.9914333329035107 3.71e-06 Your response differs significantly from the correct answer. Rework your solution from thebeginning and check each step carefully. C