Two identical balls have a mass of 1 g each. What equal charges must be placed on these balls

Two identical balls have a mass of 1 g each. What equal charges must be placed on these balls so that their interaction balances the force of universal gravity acting between them.

m1 = m2 = 1 g = 0.001 kg.
q1 = q2.
G = 6.67 * 10 ^ -11 m ^ 3 / kg * s ^ 2.
k = 8.98 * 10 ^ 9 N * m ^ 2 / Kl ^ 2.
R -?
According to Newton’s law: Ftyag = G * (m1 * m2) / R ^ 2.
According to Coulomb’s law: F = k * (q1 * q2) / R ^ 2.
G * (m1 * m2) / R ^ 2 = k * (q1 * q2) / R ^ 2.
G * (m1 * m2) = k * (q1 * q2).
G * m1 ^ 2 = k * q1 ^ 2.
q1 = √ (G * m1 ^ 2 / k).
q1 = √ (6.67 * 10 ^ -11 m ^ 3 / kg * s ^ 2 * (0.001 kg) ^ 2 / 8.98 * 10 ^ 9 N * m ^ 2 / Cl ^ 2) = √ 7420 * 10 ^ -30 = 86 * 10 ^ -15 Cl.
Answer: q1 = q2 = 86 * 10 ^ -15 Cl.