Electric fields multiple choice questions

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Attachment 727704The questions are:
5)Which graph shows variation of electric field along AD?
6)Which graph shows the variation of electric potential along AD?

The charge at C is now replaced with a negative charge of the same size
7)Which graph now shows the variation of electric potential along AD? 8)Which graph shows the variation of electric potential along AD?

For question 5 my logic was that the charge will cancel out between B&C so it would have to be B or D. Then I thought that the electric field between B and the midpoint would be negative as it is against the line AD. But I am not sure why it is initially positive or why it ends as negative.

Question 6 my logic was that electric potential needs to be positive between two positive charges. However, I am not sure why it is at a minimum at B/C.

No clue on Q7 or Q8, any help would be appreciated.
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