Final answer:
Electric field lines for two equal magnitude opposite charges will radiate from the positive charge and end at the negative charge, indicating the force direction on a positive test charge. Field lines are denser closer to charges and must be perpendicular to equipotential surfaces.
Step-by-step explanation:
When visualizing the electric field generated by two charges of opposite polarity but equal magnitude, the electric field lines will emanate from the positive charge and end at the negative charge. This pattern of field lines indicates the direction in which a positive test charge would move if placed in the field. The field lines are drawn starting radially outwards from the positive charge and curve as they approach the negative charge, eventually terminating on that negative charge. The density of these lines represents the strength of the electric field, which is stronger where the lines are closer together, namely near the charges themselves.
To draw the lines correctly, it's essential to remember that these field lines never cross and that they are perpendicular to equipotential surfaces, which are surfaces over which a test charge would have the same potential energy. For two charges of different magnitudes, the spacing between the field lines would not be uniform because the charge with a higher magnitude would have more lines ending on or beginning from it, reflecting its stronger influence on the electric field.