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ch24_p25 - 25 The disk is uniformly charged This means that...

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25. The disk is uniformly charged. This means that when the full disk is present each quadrant contributes equally to the electric potential at P , so the potential at P due to a single quadrant is one-fourth the potential due to the entire disk. First find an expression for the potential at P due to the entire disk. We consider a ring of charge with radius r and (infinitesimal) width dr . Its area is 2 π r dr and it contains charge dq = 2 π σ r dr . All the charge in it is a distance 2 2 r D + from
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