Question

When charges build up on a surface they:

Answer 1

I believe the correct answer from the choices listed above is the third option. When charges build up on a surface they, apply a force to charges wandering nearby and create an electric field. 

Hope this answers the question. Have a nice day.

Answer 2

Answer: A and B

Explanation:

An electric field develops around a charge. The electric field lines represent the region in space where a positive test charge experiences an electric force. A electric force exists between  the two charges.

Thus, when charges build up on a surface, they apply force to charges wandering nearby and also create electric field. So, correct option is Both A and B.