There is a force between two charged objects. To decrease the magnitude of the force, we can There is a force between two charged objects. To decrease the magnitude of the force, we can Move the objects farther from each other or increase the charge on either of them. Move the objects closer to each other or increase the charge on either of them. Move the objects farther from each other or reduce the charge on either of them. Move the objects closer to each other or reduce the charge on either of them.

We can move the objects farther from each other, or reduce the carge on either of them.

Explanation:

If the charged objects can be treated as point charges, the force between them, must obey the Coulomb's law:

       

where q₁, q₂, are the charges on each object, and r₁₂, the distance along a straight line between both charges.If we want to reduce the value of F, we can decrease the value of either of the charges (as the magnitude of the force is directly proportional to the product of the charges), or increase the distance between them (As the force is inversely proportional to the square of the distance, which is consequence of our universe being three-dimensional).

Independent variable is something that is changed in a experiment. 

He sandals were out in the sun so the got hotter. which is why her feet felt hot.