109. (a) We denote the surface charge density of the disk as σ1for 0 < r < R/2, and as 2for R/2 < r < R. Thus the total charge on the disk is given by ()2212disk0222627292232.20 10 m1.50 10 C m3 8.00 10 C m1.48 10 C .RRRqdqrdrrdrRσσσ−−−−π==π+π=+4π⎡⎤=××+×⎣⎦4∫∫∫(b) We use Eq. 24-36: VzdV kRdRzRRzRzzRzRRRRbgbg′′+′++′
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This note was uploaded on 06/03/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.