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PHY 2054 Magnitude of The Electric Field Exam

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Physics

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College Physics II
PHY2054. Summer 2020
Exam I, Time 60 minutes
Name:
Please mark your answers to the multiple choice questions and put the final number with correct
units for the questions which require calculations. For each question involving calculations, the
multiple choice part weights 5 points; correct number 9 points; correct units 1 point. Use scratch
paper for your calculations but don’t submit it. Submit only this file with your answers.
Coulomb constant: k
= 9.0 x 10
9
Nm
2
/C
2
; ε
0
= 8.86x10
-12
C
2
/Nm
2
1. (10 points) Two positive charges q
1
separated by the distance r
1
repel with the force F
1
. Two
other positive charges q
2
= 4q
1
are separated by distance r
2
= 2r
1
. What is the force between
them in terms of F
1
?
A. F
2
= 8F
1
B. F
2
= 4F
1
C. F
2
= 2F
1
D. F
2
= F
1
E. F
2
= F
1
/2
F. F
2
= F
1
/4
G. F
2
= F
1
/8
2. (15 points) Three charges are placed along axis x with coordinates x = 0 m, x= 0.4 m, x = 1.0 m
(see figure below). If q = 5nC find the direction and magnitude of the electric field at the
following points:
a) x = - 0.1 m; -4251.57 N/C towards left.
b) x = 0.3 m; 9224.43 N/C towards right.
To solve this problem I used the formula:
A. E = V/d;
B. E =
(kq)/r
C. E = (kq
1
q
2
)/r
2
D. E = (kq)/r
2
-2q
3q
q
x
0
0.4 m
1.0 m

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3. (15 points) You have a parallel plate capacitor with plate area of 2 m
2
and vacuum separation of
1.5 mm. What voltage should you apply to this capacitor to charge it to the charge of 1.5 μC?
(5 points) To solve this problem I needed to:
A. Use the equation E=V/d;
B. Calculate the Coulomb’s forces acting on the charges;
C. Use the equation C = Q/V;
D. Use the equation C = V/Q;
E. Use the equation C = ε
0
A/d
F. A and D;
G. C and E.
127.11 V
4.(15 points) Determine the equivalent capacitance of the combination shown below if C = 12 F.
Now our goal is to store the maximum possible energy using these capacitors connected to a
given voltage V. To achieve this goal we have to:
A. Connect all capacitors in parallel;
B. Connect all capacitors in series.
6 µF
5. (10 points) Which of the following statements is(are) correct:
A. Resistivity purely depends on internal properties of the conductor;
B. Resistance purely depends on internal properties of the conductor;
C. Resistivity depends on the size and shape of the conductor;
D. Resistance depends on the size and shape of the conductor;

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College Physics II PHY2054. Summer 2020 Exam I, Time 60 minutes Name: Please mark your answers to the multiple choice questions and put the final number with correct units for the questions which require calculations. For each question involving calculations, the multiple choice part weights 5 points; correct number 9 points; correct units 1 point. Use scratch paper for your calculations but don’t submit it. Submit only this file with your answers. Coulomb constant: k = 9.0 x 109 Nm2/C2; ε0 = 8.86x10-12C2/Nm2 1. (10 points) Two positive charges q1 separated by the distance r1 repel with the force F1. Two other positive charges q2 = 4q1 are separated by distance r2 = 2r1. What is the force between them in terms of F1? A. F2 = 8F1 B. F2 = 4F1 C. F2 = 2F1 D. F2 = F1 E. F2 = F1/2 F. F2 = F1/4 G. F2 = F1/8 2. (15 points) Three charges are placed along axis x with coordinates x = 0 m, x= 0. ...
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