# Attract or Repel?

There are four plates: $$A,$$ $$B$$ and $$D$$ are charged plastic plates and $$C$$ is an electrically neutral copper plate. The electrostatic forces between some pairs of the plates are as follows: \begin{align} A \rightarrow & \leftarrow B \\ C \rightarrow & \leftarrow A \\ \leftarrow D \quad & \quad A \rightarrow \end{align} For the pair $$B$$ and $$D,$$ do the plates repel or attract each other?

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