- Recent questions asked on Physics
- 0
### Converting velocity vector formula from Cartesian coordinate system to polar coordinate system

I have a little question about converting Velocity formula that is derived as, $$\vec{V}=\frac{d\ve…

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### Mechanism behind spin orbit interaction

The spin orbit coupling can be explained through two different frames one is the electron frame and …

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### What is the physical meaning of this result?

I am reading this paper about the cubic order in spin term on the dynamics and emission of gravitati…

- 1
### Resistance and temperature mathematical relationship of a thermistor

When I did an experiment measuring the Resistance of a thermistor as I increase or decrease the temp…

- 3
### Propagation of uncertainties

I have five values for the volume of sodium hydroxide needed to neutralise a fixed quantity of hydro…

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### An uncertainty principle modification of GR? [closed]

Can we modify the GR field equations to contain uncertainty and then use an assumption that the unce…

- 4
### Why do I lose signal in a train but not in a car?

Mobile phone signals seem to be interrupted very often when travelling by train. I have been wonderi…

- 1
### Will the track length increase to keep the light velocity constant?

Assuming light travels at 3 km/sec(for calculation purposes), what happens when a 1 km long train mo…

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### What would the capacitance of a capacitor be in this scenario? [closed]

The capacitor consists of two cubes. One big cube with the length of its edge as '3a'. Inside…

- 1
### Gauss Law Doubt

I have a doubt regarding whether or not I can take a spherical surface as a Gaussian surface when th…

- 1
### Proving that the sum of an operator and it's adjoint is Hermitian

I can solve the two questions using matrices in math, but we are expected to show it in form of th…

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### Solving electron's motion in undulator by boris method

I am trying to use Boris scheme to solve the electron trajectory when electron passing through undul…

- 3
### Kinematics: Circular Motion

What is the difference between angular velocity and angular speed? Is angular velocity after one com…

- 0
### Magnetic field "lines" in $D \ne 4$ spacetimes

The electromagnetic field is represented by an antisymetric tensor $F_{ab} = -\, F_{ba}$ (the farada…

- 0
### How to compute trapped surfaces given a metric?

This is a very basic question, but I have trouble finding a concise answert to that without having t…

- 1
### What makes pasta go into a vertical position while boiling?

I began boiling pasta on a power burner on our stove. After about ten minutes, I looked into the po…

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### Why does water boil harder when you push a ladle to the bottom of the pot?

Noticed this today while cooking, can someone explain?

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### Doubt in understanding the potential energy of dipole in external electric field?

When a dipole is placed in external electric field it experiences a torque $$\vec \tau = \vec p \ \t…

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### Why is contact resistance proportional to $\frac{1}{\sqrt{F}}$ not $\frac{1}{F}$?

See pages 13-15 in "Electrical Contacts: Principles and Applications" for reference. Imagine the fo…

- 1
### Diffraction grating angle

Why have they taken the angle to be 90 degrees? And why have they used only one of the wavelength…

- 2
### How does one calculate the force applied on an object by a magnetic field?

I've tried very hard to find an answer to this question, and every path leads me to an abstract disc…

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### If the weak energy condition is violated, can the area of the event horizon decrease?

Premise: WEC = weak energy condition; A = event horizon cross section area; WCC = weak cosmic c…

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### Troubles with stimulated emission of single photons and the no cloning theorem

I think I don't understand something basic about stimulated emission: it seems to violate the no clo…

- 1
### Black hole Travel

Asking out of curiousity. All answers appreciated. You have a machine that generates micro black h…

- 2
### Is "Introduction to Elementary Particles (2nd Edition, 2008)" by David Griffiths still relevant to start with particle physics? [closed]

The book is generally recommended, but it's from 2008. Are there any big discoveries or changes in t…

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### Electrostatic Energy of a solid sphere with cavity

Determine the electrostatic energy U stored in the sphere I tried to use $U = ε_0/2 \int E^2d\tau…

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### Inner product on group theoretic coherent states and anti-commutator of Lie algebra generators

This question is related to group theoretic coherent states (Gilmore, Perelomov etc.). I consider a …

- 1
### Momentum of light in anisotropic media

This question is related to the Abraham-Minkowski controversy that has already been discussed extens…

- 1
### Doesn't universe violates law of conservation of linear momentum?

As mass of universe is not constant,it means that its linear momentum is not constant.But thinking i…

- 1
### Differing stopping voltage formula

$V_0 = hf - \phi_{col}$ In a lecture, I was give the above formula for stopping voltage. It seemed …

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