What materials can I use to block/shield magnetic fields?
Magnetic fields cannot be blocked, only redirected. The materials that will redirect magnetic fields are materials that are ferromagnetic (attracted to magnets), such as iron, steel (which contains iron), cobalt, and nickel.
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Iron: Iron is a ferromagnetic material, which means it is strongly attracted to magnets and can be used to block a magnetic field.
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Steel: Steel is also ferromagnetic and can be used to block a magnetic field.
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Mu-metal: Mu-metal is an alloy that is made up of several ferromagnetic materials, including nickel, iron, and cobalt. It is highly effective at shielding magnetic fields.
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Other Metals: Other metals, such as brass, copper and aluminum can also be used to block or shield against magnetic fields, but they are not as effective as iron, steel, or mu-metal.
It is also possible to reduce the strength of a magnetic field by increasing the distance between the magnet and the object you want to protect. The strength of a magnetic field decreases with distance, so increasing the distance between the magnet and the object will reduce the strength of the field.