Q.List four properties of electric field lines, and use these properties to explain why two field lines can never intersect each other.

Four properties of electric field lines: (1) they always start on a positive charge (or come from infinity) and end on a negative charge (or go to infinity); (2) the density of lines (how closely packed they are) represents the magnitude of the field -- closer together means stronger field; (3) they are continuous curves that never appear or break off abruptly in empty space; (4) in an electrostatic field they never form closed loops, since the electrostatic field is conservative. …

List the standard properties, then use the "single direction at a point" argument specif …

• Only listing the properties without connecting them to the no-crossing explanation the question specifically asks for. …