21.34. Point charge q1 = -5.00 nC is at the origin and point charge q2 = +3.00 nC is on the x-axis at x = 3.00 cm. Point P is on the y-axis at y = 4.00 cm. (a) Calculate the electric fields E1 and E2 at point P due to the charges q1 and q2. Express your results in terms of unit vectors (see example 21.6 in the textbook). (b) Use the results of part (a) to obtain the resultant field at P, expressed in unit vector form.
Similar to 21.100
21.100. Two horizontal, infinite, plane sheets of charge are separated by a distance d. The lower sheet has negative charge with uniform surface charge density -3. The upper sheet has positive charge with uniform surface charge density . (a) What is the magnitude of the electric field above the upper sheet? (b) What is the magnitude of the electric field below the lower sheet? (c) What is the magnitude of the electric field between the sheets?
A semicircle of radius is in the first and second quadrants, with the center of curvature at the origin. Positive charge is distributed uniformly around the left half of the semicircle, and negative charge is distributed uniformly around the right half of the semicircle in the following figure.
21.99. Two 1.20 m nonconducting wires meet at a right angle. One segment carries 2.50 mC of charge distributed uniformly along its length, and the other carries -2.50 mC distributed uniformly along it, as shown in the figure. (a) Find the magnitude and direction of the electric field these wires produce at point P, which is 60.0 cm from each wire. (b) If an electron is released at P, what are the magnitude and direction of the net force that these wires exert on it?
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