Question

Two equal and similar charges 0.03m apart,in air,repel each other with a force of 4.5×9.8N.Find the charge in coulomb

Answer 1

Answer:

21*10^(-5)

Explanation:

F=Kq1q2/r^2

4.5*9.8=Kq^2/(0.03*100)^2

4.5*9.8=Kq^2/9

K=9*10^9

4.5*9.8=9*10^9 q^2/9

4.5*9.8/10^9=q^2

(4.5*9.8/10^9)^1/2=q

q=21*10^(-5)