The repulsive forces between two point charges is given by the following rule:
F = (k x q1 x q2) / (r^2) where:
q1 and q2 are the charges
k is coulomb's constant = 9 x 10^9 N. m2/ C2
r is the distance between the two charges.
Assume that q1=q2=q
Applying in the above equation, we find that:
0.22 = (9 x 10^9 x q^2) / (0.15^2)
0.22 = 4 x 10^11 q^2
q^2 = 5.5 x 10^-13
q = 7.4 x 10^-7 C
Therefore, the value of each of the two charges is 7.4 x 10^-7 C
