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Coulomb's law in vector form{:[ vec(F)_(12)=(kq_(1)q_(2)(( vec(r))- vec(r)^(')))/(|(( vec(r))- vec(r)^('))|^(3))],[" Here " vec(F)_(12)=" force exerted by "q_(2)" on "q_(1)],[ vec(r)=" position vector of "q_(1)],[ vec(r)^(')=" position vector of "q_(2)],[k=" Coulomb's constant "=9xx10^(9)Nm^(2)//c^(2)]:}Take q_(3) at origin.Force exerted by q_(3) on q_(1):-{:[ vec(gamma)=3.0m hat(j)"," vec(gamma)^(')=0 hat(i)+0 hat(j)],[ vec(gamma)- vec(gamma)^(')=(3m) hat(j)","|( vec(gamma))- vec(gamma)^(')|=3m],[ vec(F)_(13)=((9xx10^(9)Nm^(2)//c^(2))(2.0 xx10^(-7)c)(-1.0 xx10c)(3(m))( hat(j)))/((3(m))^(3))],[=(-2.0 xx10^(-5)(N)) hat(j)]:}Force exerted by q_( ... See the full answer