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Sep
9
comment Virtual Work: How is the applied force related to the coordinates chosen?
+1 but I think you need to emphasise for the benefit of the OP that if the δris were independent of one another, you could choose to set all of them to zero apart from δr1; this would then imply Fa1 MUST = 0 since the equation is true for all F δr. You'd also be able to do the same for δr2 etc which then implies that Fai=0.
Jul
26
answered How is voltage generated due to difference in temperature in a thermocouple?
Jul
2
awarded  Curious
Jun
26
comment What makes Poynting's theorem consistent for a charge moving in a static electric field?
@user37496 yes, I realized this after asking the question so made it into a brief answer.
Apr
29
comment Confusion about Length Contraction in special relativity
$$\Delta t_1 = \gamma \Delta t_o$$ $$\Delta t_2 = \gamma \Delta t_o $$ There should be a unique $\gamma_1$ and $\gamma_2$ for $S_1, S_2$ since they're moving at different velocities to one another, and therefore also to frame $S_0$. I feel this question is too localized.
Apr
29
answered Proof of Thevenin and Norton theorem
Apr
15
comment Why does Einstein say contradictions arise from treating the EM field as lines of force?
@WetSavannaAnimalakaRodVance I can remember reading Feynman somewhere giving a similar argument: The model of magnetic field lines as being gears and cogs, stresses etc in the medium in one frame, but then disappearing in another frame.
Apr
14
answered Why does Einstein say contradictions arise from treating the EM field as lines of force?
Apr
6
comment Is there an analogue of a geodesic for the evolution of the electromagnetic field?
What about using the proper time of the center of electromagnetic momentum frame?
Mar
10
accepted How does isotropy of free space imply $L(v^2)$ for a free particle?
Mar
10
asked How does isotropy of free space imply $L(v^2)$ for a free particle?
Jan
16
awarded  Yearling
Dec
13
answered Relationship between mass preserving four-fources and proper acceleration
Dec
5
awarded  Popular Question
Sep
20
answered Why isn't the product rule used in the definition of mechanical work?
Sep
20
answered Moving the plates of a charged capacitor to calculate energy density - where's the flaw in my argument?
Sep
7
revised There is no such thing as magnetism?
Add images to improve clarity
Aug
30
revised There is no such thing as magnetism?
added 51 characters in body
Aug
30
revised There is no such thing as magnetism?
improved clarity
Aug
30
revised There is no such thing as magnetism?
improved clarity