Lesson Plan: The Magnetic Field due to a Current in a Solenoid Physics

This lesson plan includes the objectives, prerequisites, and exclusions of the lesson teaching students how to calculate the magnetic field produced by a current in a solenoid.


Students will be able to

  • use 𝐵=𝜇𝑁𝐼𝑙 to find the magnetic field strength at the center of a solenoid,
  • use 𝐵=𝜇𝑛𝐼 for the same results,
  • identify from a diagram of a current-carrying solenoid which way the magnetic field at different points around the solenoid points.


Students should already be familiar with

  • the idea that current-carrying wires produce magnetic fields,
  • the shape of the magnetic field produced by a single loop of current-carrying wire.


Students will not cover

  • other geometries: straight wire, rectangular wire, and single circular loop,
  • the vector forms of this formula,
  • the magnetic field produced by time-varying currents,
  • electromagnetic induction,
  • inductance,
  • transformers.

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