What visual representation indicates the direction of electric force on a positive charge?

The visual representation that indicates the direction of electric force on a positive charge is lines of force. These lines, also known as electric field lines, are used in physics to illustrate electric fields. The direction of the lines of force points away from positive charges and toward negative charges, demonstrating how a positive test charge would move within the field.

The density of the lines indicates the strength of the electric field; where the lines are closer together, the electric field is stronger. This is particularly important for visualizing how forces interact within an electric field, allowing one to predict the behavior of charged particles.

While vectors can represent both magnitude and direction of forces, they do not specifically illustrate the field's configuration as effectively as lines of force. Similarly, magnetic lines represent magnetic fields, and electric pathways do not effectively convey the direction of forces specific to electric charges. Thus, lines of force are the most accurate and illustrative representation for indicating the direction of electric force acting on a positive charge.