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Continue to ChatLagrangian for magnetic portion of Lorentz force https://peeterjoot.com/2015/09/26/lagrangian-for-magnetic-portion-of-lorentz-force/
Lagrangian for magnetic portion of Lorentz force https://peeterjoot.com/2015/09/26/lagrangian-for-magnetic-portion-of-lorentz-force/