1. This small group activity is designed to help students connect much prior learning in a single problem involving magnetic fields.
  2. Students are asked to create an integral expression for the magnetic vector field everywhere in space caused by a ring with total charge $Q$ and radius $R$ spinning with period $T$ and to develop the power series expansion for the potential near the center or far from the ring.
  3. The wrap-up discussion focuses on how to deal with a vector cross product in an integrand.

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