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===== Prerequisites =====

  * **Cross Product** (for right hand rule stuff and in Biot-Savart)
  * **Line Integrals**  (for using the Biot-Savart Law for linear current densities)
  * **Surface and Volume Integrals** (optional) (for surface and volume current densities)
  * **Electrostatic Potential & Electric Field for a Ring of Charge** (for comparison with the spinning ring)

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