What term describes a water solution of ionic substances that can conduct an electric current?

The term that describes a water solution of ionic substances capable of conducting an electric current is "electrolyte." An electrolyte is a substance that, when dissolved in water, dissociates into ions. These free-moving ions are essential for conducting electricity, as they carry charge through the solution.

In practice, when ionic compounds such as sodium chloride are dissolved in water, they break apart into sodium ions (Na+) and chloride ions (Cl-). The presence of these ions in solution allows electrical current to flow, which is a key principle in various applications, including batteries and electrolysis.

The other choices do not appropriately describe the phenomenon. An electromagnet refers to a type of magnet in which the magnetic field is produced by an electric current, rather than a solution conducting electricity. Electrical force relates to the interaction between charged objects but does not specify a solution or its ability to conduct current. Electric potential energy refers to the energy stored due to an object's position in an electric field, rather than a property of solutions. Therefore, "electrolyte" is the correct and specific term for a solution with these conductive properties.