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A certain region of space is to be shiel...

A certain region of space is to be shielded from magnetic fields. Suggest a method.

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This can be achieved by surrounding the region by soft iron rings. Magnetic field lines will be drawn into the rings, and as a result the enclosed space will be free from the magnetic field. But this shielding is only approximate as compared to the perfect electric shielding of a cavity in a conductor placed in an external electric field.
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