Which of the following is/are not the main difference between electric lines of force and magnetic lines of force ?
(1) Electric lines of force are closed curves whereas magnetic lines of force are open curves.
(2) Magnetic lines of force cut each other whereas electric lines of force do not cut.
(3) Electric lines of force cut each other whereas magnetic lines of force do not cut.
(4) Electric lines of force are open curves whereas magnetic lines of force are closed curves