# All Questions

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### electrostatics and current electricity

What is the difference between potential difference and electromotive force.potential difference is da work done when 1 columb of charge move one region to another
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### Speed of fusion reactions compared to fission reactions?

How do the reaction rates of fusion and fission reactions compare? Is one faster than the other? What effect does this have on nuclear weapon designs?
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### Light from Absolute 0

Would matter that is cooled closest to instant to a near 0 temperature emit light?
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### Cold Solid Matter at the End of a Black Hole's Acceleration Disk?

Is it possible that black holes magnetic field are rapidly cooling matter using a type of magneto caloric effect and cold fusion creating new matter only possible with a black hole's gravity? ...
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### What does it mean to be unique in terms of vector potentials?

I have a feeling this may be a stupid question... let me proceed; I was in an electro-magnetism lecture, we were looking at the magneto-static maxwell’s equations: $$\triangledown\cdot\textbf{B}=0$$ ...
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### Data storage in flash drives

In a pen drive, I have read that data is stored by trapping the electrical signals sent from the computer in silicon dioxide chambers. But what I dont understand is that how does the electrical signal ...
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### Newton's Ring Experiment-The constant

In the newton's ring experiment, it is given in my lab manual that the radius of curvature of a plano-convex lens is calculated by taking the constant k in the denominator to be 20.I dont understand ...
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### Why can't we see black hole?

Is it all because it's so black . but even our tech is not able to see black holes . we can only tell where black holes are, when they are eatting star . Or it's because it can consume Light
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### Is it possible to avoid static electricity?

Sometimes I touch a car or a door and I feel the static electricity in my hand and it hurts sometimes. I try not to touch anything because I feel like I am going to feel this pain again. Is there a ...
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### Do I need to consider the spin of electrons when they are in infinite potential well

This is the problem I have And this is one of my books tell me what should I do And my question is: Do I need to consider spin in this case?(that is, I don't think the book is right...) I found ...
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### Ohm's law experiment

I was going through my physics laboratory manual. In the Ohm's Law Experiment, the book states a few precautions without any reasoning. 1.The wire whose resistance has to be determined should ...
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### What constitutes an answer to a physics question on this forum? [migrated]

On this page Dr. Pierre-Marie Robitaille: On the Validity of Kirchhoff's Law there are the following comments this might enlighten you rationalwiki.org/wiki/Pierre-Marie_Robitaille . There was ...
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### Half deflection in a galvanometer

Why is half deflection taken while measuring the resistance of a galvanometer? Can't we take deflection in other ratios? Please help.
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### Importance of CP violation

To explain the matter-antimatter assymmetry, CP should be violated according to Sakharov conditions. Charge conjugation is required as matter and antimatter have opposite charges but why Parity ...
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### Elastic collision / relative velocity problem [on hold]

I'm having some trouble with a homework exercise and I'd really appreciate some help! I've done the first part correctly (according to the solution sheet), but I can't seem to get the second part ...
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### Helical motion of charged particle in external magnetic field

When an electron moves in uniform external magnetic field, with velocity not perpendicular, I understand that the magnitude of force is only due to the perpendicular component of velocity and is ...
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### Normalizing ket vectors

So I've run in to a bit of a notation problem on my coursework I have a vector, |A> expressed in the orthogonal basis |1> and |2> |A> = |1> + i |2> I need to convert it into bra form to normalize ...
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### What am I doing wrong while proving time dilation using Minkowski space-time diagram?

Consider two events A and C. They have same value of x' and time interval between them is $\triangle \tau$. This is the proper time interval between the events. ...
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### Is light relative?

I was wondering, if two cars (A and B) are going at different velocities let's say A=90km/h, B=80km/h then if we add the two speeds we get 170km/h meaning they are relative to each other. But if one ...
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### Fundamental forces

I read @ http://m.particleadventure.org/electroweak.html Physicists concluded that, in fact, the weak and electromagnetic forces have essentially equal strengths. This is because the strength of the ...
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### De-broglie wavelength [on hold]

The de-broglie wavelength of an electron emitted from the ground state of an H-atom after the absorption of a photon equals 1/2 of the de-broglie wavelength when it is in orbit. The energy of the ...
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### How can “…electrons flow in metals, but not in the ground…” explain grounding rods?

I really enjoyed Why is the charge naming convention wrong? But, in the comments at the very end, the statement that "...electrons flow in metals, but not in the ground..." left me uneasy. I was ...
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### How does a point charge interact with a Gaussian surface?

A spherical Gaussian surface encloses a point charge $q$. The point charge is moved to to a point away from the center of the sphere. Does the electric field at a point on the surface change? ...
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### How to show state functions are perfect differentials, or vice-versa?

Suppose a variable $z$ is a function of two independent variables $x$ and $y$. Now, if z can be expressed in its total differential form as $$dz=Mdx+Ndy$$ Then show that $z$ is a state function iff ...
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### Derived Geometry and Deformation Quantization

Can anyone please explain to me in layman' terms what derived geometry deals with and what deformation Quantization is? I have only a good understanding of Relativity,Classical Mechanics.
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### Magnetic field in two different medium

From Faraday's law of induction we know if we have a coil with ac current it will create ac current to other coil placed within magnetic field. My question is if one coil is in water and another coil ...
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### Calculation Equivalent Resistance In A Circuit With resistances connected in a circle

I am having trouble in finding the equivalent resistance between the terminals 'a' and 'b' in the following circuit: Please can anyone explain to me how to solve such problems. Thank You!
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### Why do we see discrete light spikes coming out from a light source?

When we look at a light source from a distance in suitable darkness, why do we see discrete light spikes coming out of source like Fig. b of above picture instead of Fig. a?
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### The Vectors in $v=f\lambda$

We are learning about waves in physics and I was just wondering what are the vectors and what are the scalars in this function:$$v=f\lambda$$ I know the velocity $v$ is a vector so that means that: ...