A 6.7 × 10‐⁶C charge is located 0.30 m from a -5.3 × 10-⁶ charge. What is the magnitude of the force that the positive charge exerts on the negative charge?​

Idon’t quite understand this problem

Polly is pushing a box across the floor with a force of 30 n. the force of gravity is –8 n, and the normal force is 8 n. which value could describe the force of friction if polly could not move the box?

How to calculate voltage drop in a series circuit