WAEC - Physics (2001 - No. 39)
Which of the following statements about magnetic lines of force is not correct?
a magnnetic line of force is an imaginary line which the north pole of a magnet would describe if it is free to moves
magnetic lines of force do not cross one another
magnetic lines of force are closely packed together at neutral point
the presence of magnetic lines of force in a region indicates the presence of a magnetic field
Giải thích
At a neutral point, the magnetic field is weak or zero, so the magnetic lines of force are not closely packed together. Instead, they are sparse in that region.