What force occurs between unlike charges?

The correct answer is the attraction of electric charges. This phenomenon occurs due to the fundamental principle of electrostatics, where opposite charges (unlike charges) exert an attractive force on each other. For example, a positively charged object will attract a negatively charged object. This attraction happens because the charges create an electric field that pulls the opposite charge towards them.

Understanding this helps explain various electrical phenomena, such as why a charged balloon can stick to a wall after being rubbed against hair or why a positively charged rod can attract small pieces of paper. The interaction between unlike charges is a fundamental concept in electricity that illustrates how charges interact and influence each other in an electric field.