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TitleElectric Charge and Electric Field
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43) A dipole with a positive charge of 2.0 μC and a negative charge of -2.0 μC is centered at the
origin and oriented along the x-axis with the positive charge located to the right of the origin.
The charge separation is 0.0010 m. Find the electric field due to this dipole at the point x = 4.0
m, y = 0.0 m. (k = 1/4πε0 = 8.99 × 109 N ∙ m2/C2)
A) 0.56 î N/C
B) -0.56 î N/C
C) 0.28 î N/C
D) -0.28 î N/C
Answer: A
Var: 40

44) An electric dipole is made of two charges of equal magnitudes and opposite signs. The
positive charge, q = 1.0 μC, is located at the point (x, y, z) = (0.00 cm, 1.0 cm, 0.00 cm), while
the negative charge is located at the point (x, y, z) = (0.00 cm, -1.0 cm, 0.00 cm). How much

work will be done by an electric field = (3.0 × 106 N/C) î to bring the dipole to its stable
equilibrium position?
A) 0.060 J
B) 0.030 J
C) 0.00 J
D) 0.020 J
E) 0.12 J
Answer: A
Var: 1

45) An initially-stationary electric dipole of dipole moment = (5.00 × 10-10 C ∙ m) î placed in

an electric field = (2.00 × 106 N/C) î + (2.00 × 106 N/C) ĵ. What is the magnitude of the
maximum torque that the electric field exerts on the dipole?
A) 2.00 × 10-3 N ∙ m
B) 1.40 × 10-3 N ∙ m
C) 2.80 × 10-3 N ∙ m
D) 0.00 N ∙ m
E) 1.00 × 10-3 N ∙ m
Answer: E
Var: 1

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