Two charges 2coulomb and 6 coulomb are separated by a finite distance. if a charge of -4 coulomb is added to each of them the initial force of 12 ×10*3 Newton's will change to
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2x6/r^2=12x10^3 eq 1
12/12x10^3=r^2
r=1/10√2
(2-4)x(6-4)x10√2
=40√2
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