56. (a) We consider the radial field produced at points within a uniform cylindrical distribution of charge. The volume enclosed by a Gaussian surface in this case is Lrπ2. Thus, Gauss’ law leads to EqArLr===||().enc0cylinderερππ20022ch(b) We note from the above expression that the magnitude of the radial field grows with r. (c) Since the charged powder is negative, the field points radially inward. (d) The largest value of
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