6. Positive charge Q is distributed uniformly throughout an insulating sphere (not a shell) of radius R, centered at the origin. A particle with a 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/72πε₀R²
(B) Q/8πε₀R²
(C) 7Q/18πε₀R²
(D) 11Q/18πε₀R²
(E) none of these

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