Answer:
The statement that is not true about magnetic field lines is:
A. They are perpendicular to the direction of the magnetic field at each point.
Magnetic field lines are not necessarily perpendicular to the direction of the magnetic field at each point. Instead, they show the direction of the magnetic field at each point. The direction of the field lines can vary depending on the configuration of the magnetic field.
Statements B and C are true:
B. They have a different shape between like poles of two magnets than between two unlike poles. This statement is true because magnetic field lines form closed loops that emerge from the north pole of a magnet and enter the south pole. Between like poles, the field lines repel each other, while between unlike poles, they attract each other.
C. They are closest together (densest) where the field is strongest. This statement is true according to the principle that the density of magnetic field lines represents the strength of the magnetic field. Where the field is strongest, the field lines are closer together, indicating a higher density of field lines.
