a) Consider the electrostatic force F_1on2 by point charge Q₁ on point charge Q₂. I now increaseQ₁ and Q₂eachby a factor of 4 withoutchanging the distance r between the two charges. By what (exact) factor willthe electrostatic force F_1on2change?

b) Consider the electrostatic force F_1on2 by point charge Q₁ on point charge Q₂. I now increase the distance r between the two chargesby a factor of 10 without changing Q₁ andQ₂. By what factor willthe electrostatic force F_1on2change, i.e., what is F_1on2,now/F_1on2,before? Give your answer with at least two significant figures.