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Please help me. I am having trouble with this question. Thanks. A metal ball and plastic ball.

A solid metal ball of radius 1.6 cm is located near a hollow plastic ball of radius 1.8 cm bearing a uniformly distributed charge of -4 nC on its outer surface. The distance between the centers of the balls is 9 cm.
 
Where would the edge of the metal ball that has an excess of positive charges?
 

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