Physics Electric Field Question?

A particle with charge 2q on the negative x axis and a second particle with charge 4q on the positive x axis are each a distance d from the origin. Where should a third particle with charge 6q be placed so that the magnitude of the electric field at the origin is zero? (Use any variable or symbol stated above as... show more A particle with charge 2q on the negative x axis and a second particle with charge 4q on the positive x axis are each a distance d from the origin. Where should a third particle with charge 6q be placed so that the magnitude of the electric field at the origin is zero? (Use any variable or symbol stated above as necessary.)
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