Two point charges of 9uC and 4uC are placed a distance of 4 m apart.
Calculate the magnitude of the force, in Newtons, on a positive
5uC charge at the midpoint between the two charges.

The magnitude of force on the charge at the midpoint is 0.1463N.

Explanation:

Given;

two point charges, q₁ and q₂ = 9μC and 4μC

a positive charge placed at the midpoint between the two charges, q = 5μC

The repulsive force between 9μC and 5μC is calculated by Coulomb's force;

The repulsive force between 4μC and 5μC is calculated by Coulomb's force;

The resultant force on the charge is calculated as;

Therefore, the magnitude of force on the charge at the midpoint is 0.1463N.

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