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Physics : Recent Questions and Answers (Page 769)

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

Composition or engineering name for Soft iron core used in electromagnets

I am trying to make an electromagnet and most online resources suggest soft iron core is used as the material. What is the composition or the engineering name for this...

Asked on 12/04/2020

1 answer

Having trouble understanding the sign (+/-) in heat engine diagram

Definition according to lecture note:Positive work means that the surroundings do work to the systemIf heat enters the system, then it is positiveConsider the following heat engine diagram: ...

Asked on 12/04/2020

1 answer

Measuring one particle on this entangled state

If we have a normalized entagled state: $$ |arangle=N (|1rangle|2rangle+|1rangle|-2rangle+|1rangle|2rangle-|-1rangle|2rangle) $$ Where $|2rangle, |-2rangle$ describes particles A and $|1rangle, |-1rangle$ particle B. If we measure this...

Asked on 12/04/2020 by forpointing

1 answer

Show that a system of intersecting $D4$-$D6$ branes is supersymmetric

The paper "Supersymmetric Gauge Theories, Intersecting Branes and Free Fermions" asserts (first paragraph, page 12,section 2.4) that a system of $N$ $D4$-branes intersecting with ...

Asked on 12/03/2020 by Ramiro Hum-Sah

0 answer

What substance is being sprayed during this scene in Chernobyl?

In HBO's Chernobyl series, after reactor no. 4's meltdown, soldiers (Chernobyl's liquidators) splash a light-brown liquid onto the ground, both streets and forest, and for washing vehicles;...

Asked on 12/03/2020 by mattia.b89

0 answer

Is gravity just electromagnetic attraction?

Recently, I was pondering over the thought that is most of the elementary particles have intrinsic magnetism, then can gravity be just a weaker form of electromagnetic attraction? But...

Asked on 12/03/2020 by Yashbhatt

8 answer

Where does the energy go when two drops combine?

Recently been studying fluid mechanics and I have a query in context with surface energy. I am aware that energy is decreased when two drops combine, But not aware of...

Asked on 12/03/2020 by JustJohan

1 answer

How to include temperature effect in optical bloch equations (optical pumping)?

My problem is about the optical pumping of Alkali atoms by circularly polarized pump light. Consider a circular polarized light ($Delta m=+1$) $$vec{E}(z,t)= vec{E}^{(+)}_0 e^{-inu t}+c.c. $$ incident on a...

Asked on 12/03/2020

1 answer

Can Z bosons mediate short-range forces between electrons?

The flavor quantum numbers and charge of Z bosons should allow it to mediate between electrons without violating any conservation rules. So at very short displacement scales do electrons actually...

Asked on 12/03/2020

2 answer

Helium balloon energy gain

I answered a question about a "vacuum balloon" and came up with a problem I feel should be simple, but I cannot find the answer. Imagine a zero-drag balloon...

Asked on 12/03/2020 by Kotlopou

1 answer

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