What is the magnitude of electrostatic force that acts on each sphere?

To calculate the magnitude of the electrostatic force that acts on each sphere, we need to know the charge on each sphere and the distance between them, as well as the value of the Coulomb's constant.

The formula to calculate the electrostatic force between two point charges is given by Coulomb's law:

F = (k * |q1 * q2|) / r^2

Where:
- F is the magnitude of the electrostatic force.
- k is Coulomb's constant (k = 9 * 10^9 Nm^2/C^2).
- |q1| and |q2| are the magnitudes of the charges on the two spheres in Coulombs.
- r is the distance between the centers of the two spheres in meters.

To determine the magnitude of the electrostatic force on each sphere, you need to know the charges on the spheres and the distance between them. Once you have these values, you can substitute them into the formula and calculate the magnitude of the electrostatic force acting on each sphere.

Note: The charges on the spheres should have the same sign for repulsion or opposite signs for attraction.