Two plastic balls with opposite charges are hung by a string close to each other. how will they interact with each other?
they will attract each other.
they will repel each other.
they will not interact.
they will move in circles.

The two balls will attract each other.

Explanation:

As we know, like charges repel each other and unlike charges attract each other.

We are given in the question, that two plastic balls are there having opposite charges that are hung by a string and are close to each other. These two charges have different charges and hence, they are considered as unlike charges.

So, these two balls will attract each other.

this is a good question! i'll do some research and come back when i have the answer!