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Consider a rotating disk of radius R with uniform surface charge density σ and angular rotation...

Consider a rotating disk of radius R with uniform surface charge density σ and angular rotation speed ω. (a) show that for an annular strip of radius r, and width dr that the current dI = ωσrdr HINT: see class notes from previous week (b) Show that the magnetic field in the center of the disk is given by

B = 1μ0σωR 2

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