The permeability of a low-carbon steel is μ=2x10-4 Wb/At.m The shape of this material is a torus (looks like a doughnut), with an inner radius ri=1.75 cm and outer radius ro=2.25 cm. Calculate its reluctance.     A. 11.9 x10-4 At/Wb.   B. 21.9 x10-4 At/Wb.   C. 31.9 x10-4 At/Wb.   D. 41.9 x10-4 At/Wb

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Type of Magnetic Material

Every material has a unique composition that defines its magnetic behavior. Some materials get attracted towards a magnet and are called magnetic materials. Based on the magnetic properties held by each material, they are classified into different types.