38. From dA = 2 π r dr (which can be thought of as the differential of A = π r ²) and dq = σ dA (from the definition of the surface charge density σ ), we have dq = ⎝ ⎜ ⎛ ⎠ ⎟ ⎞ Q π R 2 2 π r dr where we have used the fact that the disk is uniformly charged to set the surface charge
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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.