Describe the relationship between the amount of charge on an object and the strength

The electric force is directly proportional to the amount of Charge.

Explanation:

We define the electric force as the attractive or repulsive interaction between any two charged objects in an electric field.

The electric field is investigated by measuring the force on a small positive test charge. This charge is so small that it does not significantly alter the field after testing.

An object having a greater electric charge will exert a greater force on an object than an object having a smaller electric charge.

Hence the electric force is directly proportional to the amount of Charge.