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Physics : Recent Questions and Answers (Page 820)

Find answers to your questions about Physics or help others by answering their Physics questions.

How does a solar wind plasmoid split when it touches the magnetosphere?

I want to try to render (computer graphics) auroras in a physical manner as realistic and realizable as possible. I'm aware that the phenomenon hasn't been completly explained yet (as...

Asked on 09/30/2020 by kiaat

1 answer

If the radiation emitted by an accelerated electron was sent back to the electron, would the electron decelerate?

Basically I am asking if photons can be used to change the speed of an electron. Electrons emits electromagnetic radiation when they are accelerated (cyclotron radiation, etc). Can this be...

Asked on 09/30/2020 by Exocytosis

1 answer

Relation between displacement current, dielectric and time varying Electric field

I know that displacement current is produced in dielectric material due to dipole moment.I also know that displacement current is produced by time varying electric field (according to maxwell...

Asked on 09/30/2020 by sizzling_.

1 answer

Relative minus sign in radiation of gluon jets

I am trying to calculate the cross-section for electron-positron annihilation into a quark-antiquark pair and a gluon. I find that I need a relative minus sign between the two contributing...

Asked on 09/30/2020 by Jupith

1 answer

Questions concerning the Magnetic Field

Is the flux through a surface and a "close casting" the same thing? Are both these quantities equal to 0? Also, how can one tell if an arbitrary vector field...

Asked on 09/30/2020 by Lostdawn

0 answer

What is the role of time (time interval) in principle of least action?

Action is represented by $S[Q(t)]$ where $Q(t)$ is the name of a single complete path in the configuration space of a system. The path starts at the point...

Asked on 09/30/2020 by user103515

1 answer

Can a soap bubble bounce off a laser?

Clip; I presume some momentum transfer's at play, but can't put a full picture together. What's going on - why does the laser 'repel' the bubble?...

Asked on 09/30/2020

3 answer

Trace of multi-index operator in path integral?

What is the formal definition of trace of an operator? Suppose I have an operator $L^{a_1a_2..}_{b_1b_2..}(x,y)$ in which $a_i$'s and $b_i$'s are discrete indices, and $x,y$...

Asked on 09/30/2020 by Sven2009

1 answer

What does mutual induction of electric and magnetic fields in an EM wave mean?

Changes in the electric field makes changes in magnetic field and vice versa. What does this logically mean? It looks like an infinite loop. I don't understand how this helps...

Asked on 09/29/2020 by M.Mahdi

2 answer

Displacement for rotation along some axis

If I rotate something along some axis which has direction $vec Omega$, at an small angle $epsilon$ and if the position of the body is $vec R$...

Asked on 09/29/2020 by Arnab Maiti

2 answer

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