Which of the following statements are correct for electric field lines? a. Electric field lines start at positive charges and end at negative charges. Electric field lines start at negative charges and end at positive charges. b. C. Electric field lines follow the right hand-rule: they are circles around currents. d. Electric field vectors are always perpendicular to electric field lines. e. Electric field vectors are always tangential to electric field lines. f. The force on an electron always points along the direction of field lines. 9. The force on an electron always points against the direction of field lines.