Several charges in the neighborhood of point P produce an electric potential of 6.0 kV (relative to zero at infinity) and an electric field of 36
N/C at point P. Determine the work required of an external agent to move a 3.0-?C charge along the x axis from infinity to point P without any net change in the kinetic energy of the particle.
A. 21 mJ
B. 18 mJ
C. 24 mJ
D. 27 mJ
E. 12 mJ
Answer: B
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