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Physics- Repost Please Help

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Posted by Amanda E. on Saturday, February 19, 2011 at 10:10pm.

Two positive charges of magnitude q are each a distance d from the origin A of a coordinate system as shown above.
( Figure: h t t p : / /

At which of the following points is the electric field least in magnitude?

At which of the following points is the electric potential greatest in magnitude?

The answers to both questions are A but I don't know how to get these. Please help. Thank You.

No one has answered this question yet.

  • Physics- Repost Please Help -

    I cannot find your figure nor the "following points" that you are supposed to choose among.

  • Physics- Repost Please Help -

    h t t p : / /
    you need to delete the space between "h t t p : / / " to open the link since I could not post a link here... By the way, the points are drawn on the figure.. so please take a look.. and thank you!

  • Physics- Repost Please Help -

    I was able to display your figure this time. i don't know why my browser would not go there before.

    At point A, the E-fields due to the two +q charges are equal and opposite, resulting in zero field. You cannot get lower than that. So A is the answer.

    The E field is a minimum where the electric potential gradient (which equals the field) is zero. That would also be point A. That is also the point where the sum of q/r for the two charges is a maximum.

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