In Electricity and Magnetism
Which shape has the smaller demagnetization factor a thin film madia along the direction perpendicular to the plane or a sphere along any central axis?
The smallest demag. factor is the case of thin film, disc or needle parallel to the magnetic field. Actually it is zero. The demag. factor of sphere is N=1/3, needle or long r…od perpendicular to field has N=1/2. The highest possible demag. factor is 1, it is the case of thin disc or film perpendicular to the magnetic field. Other cases (apart from ellipsoid) must be solved numerically... ( Full Answer )