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Physics : Recent Questions and Answers (Page 237)

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

Curl of electric field is not zero in the case of a steady current in a loop

Say we got conducting circular loop connected to a battery . The electric field inside the loop obeys equation $vec{J}=sigma vec{E}$. Since the current flows in a circumferential...

Asked on 06/25/2021

2 answer

Defining an inner product over matrices and over vectors

In quantum mechanics, in Dirac notation an inner product is denoted as $langle A|Brangle$ and one fundamental postulate is given as follows: $langle A|Brangle = langle B|Arangle ^*$...

Asked on 06/25/2021

1 answer

How does phase coherence length depend on elastic collisions?

In the context of electron transport, it is stated in many references that the elastic scattering does not destroy phase coherence, but inelastic scattering is the source of the phase...

Asked on 06/25/2021 by highly oscillatory integrand

1 answer

Reconciling the drift velocity with Joule heating at high and low voltage

I'm trying to reconcile the particle behaviour in an electric field on the micro level with the conductor and the current properties on the macro level. As far I understand...

Asked on 06/25/2021 by alexykot

1 answer

Simulating a ball travelling down an incline

Suppose you want to do a dynamical simulation of a ball rolling (or possibly slipping) down an incline (can assume only a 2-d problem.) This page: Rolling...

Asked on 06/25/2021 by ErikR

4 answer

How does the preferance of biotic process for right handed molecules suggest we do not live in euclidean space?

At around 33:20 to 33:37 of this video, It is said that biotic processes prefer right-handed molecules and this preference is one which can not exist in...

Asked on 06/24/2021

1 answer

Experimental arrangement of photo current

In my book it say that between the cathode and anode there exist number of electrons which make the space...

Asked on 06/24/2021

2 answer

What is the definition of the Potential of Mean Force (PMF) in physics jargon?

What's the common term for PMF in statistical physics? Is it plausible to use the chemists' PMF even in non-equilibrium systems that don't follow the canonical...

Asked on 06/24/2021

1 answer

Newman-Penrose formalism: Can a normalized spin-frame be found for every null tetrad?

I have a question within the framework of spin-coefficient formalism / Newman-Penrose formalism. Suppose I have a space-time metric whose components with respect to some coordinate basis are known. I...

Asked on 06/24/2021 by blue banana

1 answer

Changing effective mass of electron using electric potential?

The Dirac equation for an electron in the presence of an electromagnetic 4-potential $A_mu$, where $hbar=c=1$, is given by $$gamma^mubig(ipartial_mu-eA_mubig)psi-m_epsi=0.tag{1}$$ I assume the Weyl basis so that...

Asked on 06/24/2021

1 answer

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