Positive charge Q is distributed uniformly throughout an insulating sphere of radius R, centered
at the origin. A particle with positive charge Q is placed at x = 2R on the x axis. The
magnitude of the electric field at x = R/2 on the x axis is:

A. Q/4πε0R2
B. Q/8πε0R2
C. Q/72πε0R2
D. 17Q/72πe0R2
E. none of these

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