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Consider the arrangement of two fixed point charges, equal in magnitude, shown in the figure.

Which of the following statements are correct for the initial motion of a third charge if it is released from rest in the vicinity of the two charges shown?

IMAGE: http://i51.tinypic.com/2akeovn.gif

A negative charge at point d will accelerate down. (false)

A negative charge at point e will accelerate up. (true)

A negative charge at point b will accelerate down.(true)

A positive charge at point a will accelerate toward the lower-left. (false)

A negative charge at point c will accelerate toward the lower-right. (true)

I have no idea why this is wrong. I thought it would be an easy, 30 second question but I just can't seem to get it. The answers to the left is what I think is right, but is apparently wrong.

PLEASE, an explanation!

Ok so this is my thought process. A negative charge at D will be repulsed by the negatively charged point. A negative charge at e will be attracted to the positively charged point. B will be both attracted to the positive point and repulsed by the negative. If I draw vectors, the vector sum of A is on the top left and for C, it is on the lower right.

Just realized that this might be in the wrong section. Sorry, first time posting. Please feel free to move.

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# Homework Help: Consider the arrangement of two fixed point charges, equal in magnitude

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