Why do electromagnetic fields need magnetic shielding?

EMI, or electromagnetic interference can be a problem to designers of many products. Personal Computer manufacturers must design to meet the FCC Part 15 regulations to prevent PC's from interfering with other office equipment. Cell phone designers have to incorporate RFI shielding to stop unwanted RF emissions as well as to prevent other electrical equipment from interfering with the cellular telephone's operation. Designers may find that densely packed electronic assemblies may have internal components that interfere with each other, requiring electro magnetic shielding. When the electromagnetic interference includes low frequency radiation, magnetic shielding is essential to assure proper operation of the electronic equipment.

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