Electric field problems
Electrical Engineering
Zagazig University
10 pag.
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1 Consider a point charge q = 1.0 .C, point ,A at distance d1=2.0 m from q, and point B
1at distance d2=1.0 m. (a) If A and B are diametrically opposite each other, as in Fig. 24- a,
what is the electric potential difference VA - VB? (b) What is that electric potential difference
if A and B are located as in Fig.b
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2
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3
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4 (a) Find the potential at a distance of 1.00 cm from a proton. (b) What is the
4potential difference between two points that are 1.00 cm and 2.00 cm from a proton?
(c) What If? Repeat parts (a) and (b) for an electron.
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5 Given two 2.00 C charges, as shown in Figure P25.16, and a positive
5test charge q = 1.28 x 10-18 C at the origin, (a) what is the net force
exerted by the two 2.00 C charges on the test charge q? (b) What is the
electric field at the origin due to the two 2.00 C charges? (c) What is
the electric potential at the origin due to the two 2.00C charges?
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6 At a certain distance from a point charge, the magnitude of the
6electric field is 500 V/m and the electric potential is -3.00 kV. (a) What is
the distance to the charge? (b) What is the magnitude of the charge?
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7
Calculate the energy required to assemble the array of charges shown in Figure
P25.34, where a = 0.200 m, b = 0.400 m, and q = 6.00  C.
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8 Two protons in an atomic nucleus are typically separated by a distance of 2 x 10"15 m. The
electric repulsion force between the protons is huge, but the attractive nuclear force is even
stronger and keeps the nucleus from bursting apart. What is the magnitude of the electric force
between two protons separated by 2.00 x 10"15 m?
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9
(a) Two protons in a molecule are separated by 3.80 x 10"10 m. Find the electric
force exerted by one proton on the other. (b) How does the magnitude of this force
compare to the magnitude of the gravitational force between the two protons? (c)
What If? What must be the charge to- mass ratio of a particle if the magnitude of the
gravitational force between two of these particles equals the magnitude of electric
force between them?
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Three point charges are located at the corners of an equilateral triangle as shown
in Figure P23.7. Calculate the resultant electric force on the 7.00  C charge.
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