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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?
Wiki User
∙ 14y ago
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 rod 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...
Wiki User
∙ 14y ago
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Magnetic flux through a surface is maximum when the direction of the magnetic field is in the same direction as the normal vector of the surface. In other words, the magnetic flux is maximum when the magnetic field is perpendicular to the surface area. That's why φ=BAcosθ, where θ is the angle between the direction of the magnetic field and the normal vector of the surface area. When the magnetic field is exactly the same direction as the normal vector (aka the magnetic field is perpendicular to the surface), θ=0 and cosθ = 1, its maximum value. The closer θ is to 90 degrees (ie. the more parallel the direction of the magnetic field is to the surface area, or the less parallel the magnetic field is to the surfaces normal vector), the smaller cosθ is, and thus flux will decrease accordingly.
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