There are 5 pairs of plates ab and d are charged plastic, Ask an Expert

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There are 5 pairs of plates: A,B, and D are charged plastic plates and C is an electrically neutral copper plate. A is attracted to B, C to A, C to D, B to D..and D and A replel from each other..Please explain why those attract and this one does not. How can you tell if they attract or do not.

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