ch21-p023 - 23. The charge dq within a thin shell of...

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23. The charge dq within a thin shell of thickness dr is dq dV Adr ρ = = where A = 4 π r 2 . Thus, with = b / r , we have qd q b r d r b r r r r == = z z 42 1 2 2 2 1 2 π π c h . With
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