1. This small group activity is designed to help students wrestle with the concepts of charge density and electric field, as well as provide practice using power series approximations.
  2. Students are asked to create an integral expression for the electric field everywhere in space caused by a ring with total charge Q and radius R and to develop the power series expansion for the electric field near the center or far from the ring.
  3. The wrap-up discussion focuses on how to create an appropriate expression for an electric field.

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