Five positive charges of magnitude q are arranged symmetrically around the circumference of a circle of radius r. What is the magnitude of the electric field at the center of the circle? (k = 1/4πε0)
A. 0
B. kq/r2
C. 5kq/r2
D. (kq/r2) cos (2π/5)
E. (5kq/r2) cos (2π/5)
(GR0177 #09)
Solution:
Gauss’ Law:
There is no qenc inside the Gaussian surface → E = 0
Answer: A
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