# Two charges of 1.2 nC each interact in air with a force of 1.44 · 10 -5 N and determine the distance between the charges.

q1 = 1.2 nC = 1.2 * 10 ^ -9 C.
q2 = 1.2 nC = 1.2 * 10 ^ -9 C.
F = 1.44 * 10 ^ -5 N.
k = 8.98 * 10 ^ 9 N * m ^ 2 / Kl ^ 2.
r -?
According to Coulomb’s law, the force of interaction F between two charges is determined by the formula: F = k * q1 * q2 / r ^ 2, where q1, q2 are the values of the charges that interact, r is the distance between the charges, k is the proportionality coefficient.
r ^ 2 = k * q1 * q2 / F.
r = √ (k * q1 * q2 / F).
r = √ (8.98 * 10 ^ 9 N * m ^ 2 / Cl ^ 2 * 1.2 * 10 ^ -9 Cl * 1.2 * 10 ^ -9 C / 1.44 * 10 ^ -5 N ) = 0.03 m.
Answer: the charges are at a distance of r = 0.03 m.

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