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Physics : Recent Questions and Answers (Page 65)

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

Are both $B$ and $H$ used for magnetic field intensity?

My teachers use $B$ for representing magnetic field and the standard textbooks do so as well, but recently, one of my friends said that $B$ is magnetic flux...

Asked on 09/25/2021 by Abhyudit Singh

2 answer

What does $rm fT/Hz^{0.5}$ mean?

I was browsing the Wikipedia page for "Magnometer" and saw the figure that a caesium vapour magnetometer has a sensitivity of $300 rm fT/Hz^{0.5}.$ I understand femtotesla but I...

Asked on 09/25/2021 by Tbw

1 answer

If there is a point in a past set, does its chronological future interset a future set?

This post concerns the causality of spacetime $mathcal M$. A future set $F$ is defined to be the chronological future of some set $Sin mathcal M$, ie., $F=I^+[S]$. Similiarly,...

Asked on 09/25/2021 by Drake Marquis

1 answer

Canonical rotations that do not produce computational singularities

Intro On the topic of dynamical systems associated with 3-dimensional rotation of rigid bodies, you will always encounter singularities in the equations of motion that will produce computational errors at...

Asked on 09/25/2021 by Egeris

2 answer

Supersymmetry beyond $D=11$ spacetime dimensions

Taking into account the higher spin theories, from which string theory is an effective field theory, I just wondering if there is something to do to extend supersymmetry to any...

Asked on 09/25/2021

1 answer

Why symmetric potential has even bound ground state and does odd ground state exist?

I have read that symmetric potential has even bound ground state, but I don't know how to derive it? The only conclusion I can derive is for even potential I...

Asked on 09/25/2021

1 answer

Enthalpy during compression of water

What happens to the temperature of water when compressed? Enthalpy $H = U + PV$. $H$ is conserved in a closed system. By which I mean adiabatic...

Asked on 09/25/2021 by Tuntable

2 answer

Why electrical resistance decreases with cross sectional area?

With increase in cross sectional area the number of atoms with which electrons will collide will also increase in the same proportion. So basically the resistance shouldn't change with increasing...

Asked on 09/25/2021 by Rohit Kumar

4 answer

Why would a spinor transform under Lorentz transformations?

From my understanding of spinors, they arise as projective representations of $SO_0(1,3)$ that do not correspond to representations of $SO_0(1,3)$.But still one says here - and...

Asked on 09/25/2021 by iolo

2 answer

Step-by-step proof of the First Hohenberg-Kohn Theorem in DFT

I'm trying to proof the first Hohenberg-Kohn theorem using the Reductio ad absurdum, but I'm stucked in the last point. First, I know that the eletronic density...

Asked on 09/25/2021 by Vinícius Caetano

1 answer

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