Question: 2. A spherical shell of radii a and b has a relative permeability Km = /o for a r b. There is vacuum everywhere

2. A spherical shell of radii a and b has a relative permeability K Au/uo for a S r S b. There is vacuum everywhere else. It is placed in a previously uniform magnetic field Ho-Ho2. Show that the shielding factor, that is, the ratio Hi/Ho where Hi is the magnetic field in the cavity, is given by 9 m. 2) (2Km 1) 2 1)2(a/b) 3] 1.

2. A spherical shell of radii a and b has a relative permeability Km = /o for a r b. There is vacuum everywhere else. It is placed in a previously uniform magnetic field Ho = Ho2. Show that the "shielding factor," that is, the ratio H/H, where H; is the magnetic field in the cavity, is given by 9Km[(Km + 2)(2km + 1) 2(Km 1)(a/b)].

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