question_answer

      Which one of the statements given below is not correct?                               [NDA]

A) A vertical plane passing through the axis of a freely suspended magnet is called the magnetic meridian

B) A vertical plan passing through the axis of rotation of the Earth is called the geographical meridian

C) The degree to which the magnetic field can penetrate a medium is known as the relative permeability of the medium

D) The relative permeability is not a dimensionless quantity