SELF INDUCTION!

Joseph Henry (1797 - 1878)

ℰ = L(dI/dt)

Joseph Henry is the only physicist who has ever had a serving US President as his lab assistant. Late at night, Abraham Lincoln often assisted Henry with experiments.








RL Circuit Analysis details








is the energy per unit volume stored in E or B fields. So we can store energy either in electric or in magnetic fields, or in both at once.


A superconducting LC circuit behaves like an undamped harmonic oscillator! The energy is just traded back and forth between capacitor and inductor, in other words swapped freely between electric and magnetic fields!

Worked examples.

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