the last one c) The figure shows four point charges, and the signs of each charg
ID: 1541652 • Letter: T
Question
the last one c)
The figure shows four point charges, and the signs of each charge. The magnitude of each is + q or -q as shown and q = 5.0 n C, and the distance d = 1.5 mm. Assume the electric potential is zero at infinity. a) Calculate the net electric potential at point P. How much work is required to set up the four-charge configuration of the figure if the particles are initially infinitely far apart and at rest? c) How much external work would have to be done to switch the positions of the two positive charges? c) How much work would have to be done by an external agent to move a fifth charge, Q = 3.0nC which is initially infinitely far away, and place it at point P?Explanation / Answer
work done = Change in potential energy
change in potential energy = 0 { as final potential energy is same as initial }
Work done = 0 J
c.)last one
U = KQ*3Q/d - KQ*3Q/2d
U = 3KQ*Q/2d = 3*9*10^9*5*3*10^-18/2*1.5*10^-3 = 1.35*10^-4 J
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