NDA || MAGNETIC EFFECT OF ELECTRIC CURRENT

A charged particle moves through a magnetic field perpendicular to its direction. Then

if  is the magnetic moment and  is the magnetic field, then the torque is given by

There exist a rule to determine the direction of the magnetic field due to a long wire. It is known as,

The magnetic dipole moment of a current loop is not depending upon

Which one of the following statements about magnetic field lines is NOT correct?