Earth's magnetic field inside a closed iron box, as compared to that outside is
same
less
more
zero
A
more
B
zero
C
less
D
same
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Solution
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Due to high permeability, iron provides an easier path for the magnetic field lines rather than the air,
therefore the field lines flow through the walls of the box, making the magnetic field inside the box much less than that outside.
This phenomenon is used in magnetic shielding.
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