F = k q1 q2 /d^2
q1*q2 = 6*2 = 12
new q1*q2 = 8*4 = 32
so
(32/12)12N = 32 N
The force of interaction between two charges q1=6uC and q2=2uC is 12N. If charge q=-2uC is added to each of the charges then the new force of interaction is
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