# All Questions

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### Where is the net electric field 0?

A positive charge +3Q is separated by a distance, d, from a negative charge -Q. What is the closest distance in which the net electric field is zero.
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### Creasing of a material at the molecular level

What exactly happens when a material (particularly paper or even cloth or a metal) is folded to form a crease? Why is it that a creased material tends to retain form, while a lightly folded one, ...
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### S-matrix and derivative interaction

I just read in some lecture notes that formally we can write the S Matrix as: $$S=T(e^{-\int_{-\infty}^{+\infty} H_{int}dt})$$ Where $T$ is the normal product and $H_{int}$ is in the interaction ...
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### what is the effect of temperature on the resistance of a photoconductor?

As we know, for a photo conductor resistance tends to decrease with increase in irradiance, but with greater irradiance comes greater temperature. Also we know, photo conductors are ...
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### Why do some people support more electricity than others?

There is a game where people hold by their hands and two of them touch the electrodes of a shock box, then an electric current flows through them. I understand that since they are all making a single ...
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### Question on weightlessness

An astronaut in an artificial satellite of the earth feels weightlessness. Do they feel weightlessness on the moon too? Why? An astronaut in all artificial satellite feels weightlessness due to the ...
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### Based on newtons third law

If an elephant can apply 250N force and a rabbit can apply 25N force , and if they are pulling each other , then elephant will pull with 250N force and according to newtons third law the rabbit should ...
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### Stokes-Einstein Relationship to find time taken to diffuse $x$ distance?

A molecule has a diffusion coefficient of 0.5 × 10-9 m2s-1. Calculate how long it would take on average for the molecule to diffuse 10 µm. So I have the above ...
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### Extensiveness of entropy in classical microcanonical ensemble

In introducing microcanonical ensemble of classical statistical mechanics one pretty much starts by postulating that entropy of the system has the form $S(V,E) = k \log \Gamma(V,E)$, where $\Gamma$ ...
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### What is the relation between rhymes in terms of their wavelengths?

How are the wavelengths of any 2 rhyming words related? Eg: How is the wavelength of the sound produced bye 'fee' related to the sound produced by 'see'?
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### Phase difference in currents in parallel RC circuit

shouldn't the phase difference be 0. The potential difference across any branch at any instant should be V.so what's wrong ?btw correct answer is (C)
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### Is this state an example of a separable state or an example of an entangled state?

The Hong–Ou–Mandel effect also underlies the basic entangling mechanism in linear optical quantum computing (https://en.wikipedia.org/wiki/Quantum_computing), and the two-photon quantum state |0,2> + ...
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### How does a levy walker work?

I have read that a levy walker is a random walker which changes it direction after times which have power law distribution. is there any range for exponent of this distribution?
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### Wave drag explanation

I was reading a book and came across a definition, wave drag is the resistance from the waves created on the water surface by a moving object. I can't get it. Can somebody explain it with a diagram. ...
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### What is the exact mathematical definition of oscillation/vibration?

My question is basically is what criteria need to be fulfilled to decide wether a motion is osciliiation/vibration or not. I found two definitions, def1: "moving around an equilibrum", def2: ...