The incorrect statement regarding the lines of force of the magnetic field $\mathrm{B}$ is

• A

  magnetic intensity is a measure of lines of force passing through unit area held normal to it
• B

  magnetic lines of force forms a close curve
• Correct answer
  C

  inside a magnet, its magnetic lines of force move from north pole of a magnetic towards its south pole
• D

  due to a magnetic lines of force never cut each other

Hence, the correct answer is option: 'C'.