Choose the incorrect statement from the following regarding magnetic lines of field:
A. (a) The direction of magnetic field at a point is taken to be the direction in which the north pole of a magnetic compass needle points.
B. (b) Magnetic field lines are closed curves.
C. (c) If magnetic field lines are parallel and equidistant, they represent zero field strength.
D. (d) Relative strength of magnetic field is shown by the degree of closeness of the field lines.
