Three infinite planes of charge, A, B and C, are vertical and parallel to one another. There is a uniform electric field 
to the left of plane A and a uniform electric field 
to the right of plane C. The field ![]()
src="https://sciemce.com/media/2/ppg__cognero__Chapter_25_Gauss_apos_s_Law.__media__d157b51e-e802-42c3-b389-ecf53d0f5676.PNG" style="font-family:'times new roman';vertical-align:middle;" /> points to the left and the field points to the right. The signs of the charges on plates A, B and C may be
A. ?, ?, ?.
B. +, ?, ?.
C. +, ?, +.
D. +, +, +.
E. any one of the above.
Answer: E
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