Question

There is a repulsive force between two charged objects when

Answer 1

Answer: Both objects have charges of the same sign

When two electrically charged bodies come closer, appears a force that attracts or repels them, depending on the sign of the charges of this two bodies.

This is stated by Coulomb's Law:

"The electrostatic force
`F_(E)` between two point charges
`q_(1)` and
`q_(2)` is proportional to the product of the charges and inversely proportional to the square of the distance
`d` that separates them, and has the direction of the line that joins them"

Mathematically this law is written as:

`F_(E)= K(q_(1).q_(2))/(d^(2))`

Where
`K` is a proportionality constant.

Now, if
`q_(1)` and
`q_(2)` have the same sign charge (both positive or both negative), a repulsive force will act on these charges.