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physics

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In the rectangle in the drawing, a charge is to be placed at the empty corner to make the net force on the charge at corner A point along the vertical direction. What charge (magnitude and algebraic sign) must be placed at the empty corner?

(the rectangle has +3 uC charges in 3 corners and one empty corner. The long sides are 4d and the short sides are d)

  • physics -

    Which corner is corner A?

  • physics -

    A is the bottom left corner. The empty corner is the top right corner.

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