ch24-p109 - 109. (a) We denote the surface charge density...

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109. (a) We denote the surface charge density of the disk as σ 1 for 0 < r < R /2, and as 2 for R /2 < r < R . Thus the total charge on the disk is given by () 2 2 12 disk 02 2 26 2 7 2 9 22 3 2.20 10 m 1.50 10 C m 3 8.00 10 C m 1.48 10 C . RR R qd q r d r r d r R σσσ −− π == π + π = + 4 π × + × 4 ∫∫ (b) We use Eq. 24-36: Vz dV k Rd R zR R z R zz R z R R R R b g bg ′′ + + +
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