Homework Answers
the first change q1= 4.5 * 10-9 C
Second change q2= - 2.8* 10-9 C
the distance between them r= 3.2 m
the force between both changes 
Unlike(opposite) changes in this case.
F= (9*109) *( 4.5 * 10-9 *2.8* 10-9 ) / (3.2)2
F= (113.4/10.24) *10-9 N
F=11.074*10-9 N
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