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Find the magnetic field, as a function of z, both inside and outside the slab.

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A thick slab extending from z=-a to z=+a carries a uniform volume current J=Jx (fig 5.41 attached). Find the magnetic field, as a function of z, both inside and outside the slab.

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GRIFFITHS (5.14)

let the width of the slab is b.
b>>2*a
Outside the slab: (|z| > a)
We draw a rectangle surrounding the slab (Ampere's circuit).
BY Ampere's ...

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