Determine the strength of the pendant acting on two charges of 2nl if the distance is 4cm.

To find out the required Coulomb force, we will use the formula: Fk = k * qz1 * qz2 / r ^ 2 = k * qz2 / r ^ 2, where k is the proportionality coefficient (const; k = 9 * 10 ^ 9 N * m2 / Cl2 ); qz is the modulus of each of the presented charges (qz = 2 nC = 2 * 10 ^ -9 C); r – distance (r = 4 cm; in the system r = 0.04 m).

Let’s perform the calculation: Fk = k * qz ^ 2 / r2 = 9 * 10 ^ 9 * (2 * 10 ^ -9) ^ 2 / 0.04 ^ 2 = 22.5 * 10 ^ -6 N.

Answer: The Coulomb force of 22.5 μN acts on the two presented charges.