Larry Harson
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 Mar 14 awarded Notable Question Mar 2 awarded Notable Question Feb 21 awarded Yearling Jan 16 awarded Popular Question Nov 18 awarded Popular Question Nov 7 awarded Good Question Oct 27 awarded Popular Question Jul 6 comment Why is $F=-\nabla V$? I thought that quote came from Zee Jul 6 comment Why is $F=-\nabla V$? Gotta laugh and cry at this: "a vector anything which transforms like a vector does under coordinate transformations." I prefer the definition as a quantity with a direction and magnitude that can be calculated from a set of numbers called its components. And the components transforming under rotations such that its direction and magnitude remains invariant. May 9 accepted Is there a subtlety to the Lorentz transformations one needs to be aware of? May 6 awarded Notable Question Apr 7 awarded Altruist Apr 6 comment Tensor Operators A little OT: do you think it's worth learning about tensors from Tullio Levi-Civita's classic book? What book would you recommend for beginners? Apr 4 answered Can we rigorously define force? Apr 1 awarded Investor Mar 31 comment Quantum anharmonic ocscillator $E_0(\lambda)$ curve or table Thanks to Vladimir and you for this interesting contribution! I'm surprised you didn't import the question to PO with your usual comment: "There's an answer here on PO" ;) Mar 24 comment Can the Lorentz force expression be derived from Maxwell's equations? @WetSavannaAnimalakaRodVance I'm just judging Ben as harshly as he judged Steve B's answer( which I believe is clearly correct). The -1 remains although my original reason is not correct: $F_{total} = d\vec p/dt$ is where Ben implicity defines the electric part of the Lorentz force at $v=0$. Mar 16 awarded Popular Question Feb 23 comment Magnetic force between two charged particles? The magnetic force isn't mutually the same generally. Feb 23 comment Magnetic force between two charged particles? The Biot Savart law is for a closed circuit current, and extending this to an isolated moving charge isn't trivial.