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How do you block the magnetic field

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Magnetic fields (forces are caused by magnetic fields) cannot be blocked, no. That is, there is no such thing as a magnetic insulator.

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If you want to block out magnetic "force," your best bet is to re-route magnetic fieldlines (lines of magnetic flux) around the object that is sensitive to those lines. Do this by shielding the object in a material with a much higher magnetic permeability of the surrounding materials.

Magnetic fields can be re-routed around objects. This is a form of magnetic shielding. By surrounding an object with a material which can "conduct" magnetic flux better than the materials around it, the magnetic field will tend to flow along this material and avoid the objects inside. This allows the field lines to terminate on the opposite poles, but just gives them a different route to follow.

In order to shield the permanent magnet, for example, an electronic device from external magnetic fields, engineers will often use a shell or case that comprises of a material with a very high magnetic permeability - that is, a material that will allow a lot of magnetic flux lines within it, effectively concentrating the lines inside the material, and then "channeling" them away from the delicate electronics inside.
Looking at this from another perspective, sometimes it is necessary to ship strong magnet and magnetic materials via airplanes to their destination. There are strict Federal regulations regarding magnetic fields and aircraft instrumentation; a magnet on board must not interfere in anyway with the flight controls for obvious reasons. So, the magnets are usually packed "head to tail" to that their North poles are next to other South poles, and, thin sheets of steel, or other iron-based materials are packed around the magnets in order to "shunt" the field and to keep it from penetrating outside of the box.

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