李良

F = q (v × B) That Lorentz force just turned a handful of copper coils and high voltage into a screaming blue plasma tornado swirling at the center like a miniature star. You can literally see the charged particles getting whipped into helical paths along those B-field lines; air ionized into a glowing vortex of free electrons and ions dancing in perfect lockstep. No vacuum chamber. No fancy lab. Just raw electromagnetism flexing at atmospheric pressure. This is the same principle holding plasma in tokamaks, powering fusion research, and one day maybe driving VASIMR engines across the solar system.