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اريد طريقه الحل بالانجليزي
Multiple-choice questions
Choose the correct answer for each question
1. The electric force between two (identical) positive charges is
(a) attractive
(b) repulsive
(c) neutral
(d) zero
2. The unit of measurement of electric field is
(a) C
(b) N/C
(c) N
(d) m
3. The time constant of an RC circuit has units:
(a) second/Farad
(b) second / Ohm
(c) Farad/Ohm
(d) second
4. The magnitude of the electric field produced by a single charge q = 10-6 C, measured at a
distance d = 0.1 m from it is:
(a) 0.9 N/C
(b) 0.9 × 106 N/C
(c) 0.9 × 10-6 N/C
(d) 90 N/C
5. The magnitude of the electric force between two (identical) charges q = 10-6 C, separated
by a distance d = 0.1 m is:
(a) 0.9 N
(b) 9 × 10-15 N
(c) 9 × 1015 N
(d) 90 N
6. Two resistors R1 = 4
and R2 = 6
are attached in parallel. The equivalent resistance Rp
of the group is:
(a) Rp = 10
(b) Rp = 0.417
(c) Rp = 2.4
(d) Rp = 24
7. Two capacitors C1 = 4 F and C2 = 6 F are attached in parallel. The equivalent capacitance
of the network Cp is:
(a) Cp = 10 F
(b) Cp = 2.4 F
(c) Cp = 0.417 F
(d) Cp = 24 F
8. A cube encloses two charges +1 C and −2 C. What is the total flux of electric field out of
the cube?
(a) 0
(b) +1.13 × 1011 N m2/C
(c) −1.13 × 1011 N m2/C
(d) −1 C
9. A conductor carries charge Q at equilibrium. What is the electric field inside the conductor?
(a) 1 N/C
(b) 0
(c) Q
(d) Q/4πǫ0
10. Four electric wires meet at a junction. The first carries 4 A into the junction, the second
carries 5 A out of the junction, and the third carries 2 A out of the junction. The fourth
carries:
(a) 7 A out of the junction
(b) 7 A into the junction
(c) 3 A out of the junction
(d) 3 A into the junction
11. A 200-N/C electric field is in the positive x-direction. The electric force on an electron of
charge q = −1.6 × 10−19 C in this field is:
(a) 200 N in the positive x-direction
(b) 200 N in the negative x-direction
(c) 3.2 ×10−17 N in the negative x-direction
(d) 3.2 ×10−17 N in the positive x-direction
32
(b) Rp = 0.417
(c) Rp = 2.4
(d) Rp = 24
7. Two capacitors C1 = 4 F and C2 = 6 F are attached in parallel. The equivalent capacitance
of the network Cp is:
(a) Cp = 10 F
(b) Cp = 2.4 F
(c) Cp = 0.417 F
(d) Cp = 24 F
8. A cube encloses two charges +1 C and .2 C. What is the total flux of electric field out of
the cube?
(a) 0
(b) +1.13 ~ 1011 N m2/C
(c) .1.13 ~ 1011 N m2/C
(d) .1 C
9. A conductor carries charge Q at equilibrium. What is the electric field inside the conductor?
(a) 1 N/C
(b) 0
(c) Q
(d) Q/4ƒÎ.0
10. Four electric wires meet at a junction. The first carries 4 A into the junction, the second
carries 5 A out of the junction, and the third carries 2 A out of the junction. The fourth
carries:
(a) 7 A out of the junction
(b) 7 A into the junction
(c) 3 A out of the junction
(d) 3 A into the junction
11. A 200-N/C electric field is in the positive x-direction. The electric force on an electron of
charge q = .1.6 ~ 10.19 C in this field is:
(a) 200 N in the positive x-direction
(b) 200 N in the negative x-direction
(c) 3.2 ~10.17 N in the negative x-direction
(d) 3.2 ~10.17 N in the positive x-direction
3
a
b
+
+
+
+
−
− −
−
−
− −
−
+
+ +
+
Figure 4: Questions 18 - 20
(a) 0
(b)
Q
4πǫ0
1
r
(c)
Q
4πǫ0
1
r2
(d)
Q
4πǫ0
1
r3
19. What is the electric potential difference across the capacitor: Vab = −R a
b E(r)dr?
You may assume that
Z 1
r2 dr = −
1
r
.
(a) 0
(b)
Q
4πǫ0 1
a3 − 1
b3
(c)
Q
4πǫ0 1
a2 − 1
b2
(d)
Q
4πǫ0 1
a − 1
b
20. What is the capacitance of the capacitor C = Q/Vab
(a) 4πǫ0ab/(b − a)
(b) 4πǫ0(b − a)/ab
(c) 0
(d)
1
4πǫ0
b−a
ab
6
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