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A metal cylinder of radius a = 28 mm carries a linear charge density A = 9 x 10° Cm', as shown
in the figure below. It is surrounded, out to radius b = 77 mm, by a linear dielectric material
of relative permittivity ɛ, = 3.8 . Find the absolute electric potential at the axis of the cylinder.
Note: €o = 8.854 PFM1.
b
metal
dielectric
air

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