An annular disk has thickness t, inner radius R 1 , outer radius R 2 , and conductivity . Let a radial current I 0

An annular disk has thickness t, inner radius R₁, outer radius R₂, and conductivity σ. Let a radial current I₀ flow from the inner periphery to the outer periphery of the disk.

(a) If n is the conduction electron density, use Faraday’s law to show that a circular current

flows when a constant magnetic field B is applied perpendicular to the annular plane.
(b) Show that every origin-centered circle in the disk is an equipotential.

I= 2 Io In R R