Given:
Object A has the charge,

This charge is at the origin.
Object B has the charge,

Object B is at the point,

To find:
The magnitude of the electric force, in micro-Newtons, on object A
Step-by-step explanation:
The electric force between two charges is given by,

The distance between A and B is,

The force will be directed towards the negative charge and the magnitude is,

Hence, the electric force on A is,
