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comment What is the symmetry which is responsible for preservation/conservation of electrical charges?
I'm under the impression that one doesn't use a Lagrangian that gives unphysical solutions. This would make the whole point of using a Lagrangian in the first place pointless otherwise.
Apr
24
comment What is the symmetry which is responsible for preservation/conservation of electrical charges?
Likewise, you can derive conservation laws from Maxwell's equations that are interpreted as energy, momentum, angular momentum without using a Lagrangian and Noether's theorem. Maybe you doubt whether Noether's theorem is a valid way of generating conserved quantities in general for a physical system?
Apr
23
comment What is the symmetry which is responsible for preservation/conservation of electrical charges?
Are you saying that because the potential isn't physical, Noether's theorem doesn't apply to variation of the potential?
Apr
18
comment What is the relationship between potential energy and inertia?
Not quite. That equation is the special case of $v=0\Rightarrow\gamma=1$ for the more general equation for the total energy, rest+kinetic, of a moving particle of mass m: $E = \gamma mc^2$.
Apr
16
answered What is the relationship between potential energy and inertia?
Apr
7
reviewed Approve Wheel Sinkage Depth
Apr
5
reviewed Reject Why does force cause acceleration?
Apr
2
reviewed Reject Chance of distinguishing between many pure states
Jan
31
reviewed Edit Static Equilibrium
Jan
31
revised Static Equilibrium
typo error in the title, fixed additional minor punctuation
Jan
16
awarded  Yearling
Jan
10
reviewed Reject What will hapeen if we remove air from a pipe
Jan
7
comment Self Teaching QFT
What level of physics have you studied already? engineering level? physics undergraduate?
Jan
7
comment Self Teaching QFT
I found the whole book hopelessly deluded in its purpose. To learn QFT, you have to start with a good grasp of classical mechanics, electromagnetism, relativity, quantum mechanics. it would take at least a year of self-study to get through just one of these while holding down a job at the same time. The book you've recommended is likely to be of use to a good physics undergraduate only.
Dec
31
reviewed Approve Jaumann deviatoric stress rate
Dec
31
reviewed Approve Find electric field induced by magnetic field using maxwell equations
Dec
30
reviewed Approve Operator and apparatus in quantum mechanics?
Dec
29
reviewed Reject Why does a stream of water behave like this when aimed against a spoon or into a glass?
Dec
29
reviewed Reject What does $δF=0$ imply?
Dec
26
reviewed Approve Is the Earth's molten outer core affecting its motion?