# Questions tagged [potential]

Scalar and vector potentials in electromagnetism. The scalar potential is potential energy per unit charge. For potential energy, use the [potential-energy] tag.

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### Is electric potential at a point defined due to an “isolated” point charge?

If there is a fixed point charge then it has its fields in the surrounding and it doesn't matter whether there is another charge near or not. But for potential, it is defined as electric potential ...
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### Confusion with Electrostatic Potential Difference

Suppose that you have a positively charged plate at a plane (xy-plane, for example). Therefore this plate exerts an electric field with a magnitude of σ/2ε₀. Due to this, there will be the same ...
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### Solid Conducting sphere is placed inside a metallic shell the conducting sphere is given a charge Both are connected does all charge flow to the shell [closed]

Here the solution says that all the charge goes into the outer shell, is this correct ? If then why ? Shouldn't the charge transfer happen until the potentials of the outer shell and inner conductor ...
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### Potential difference across two points in a current-carrying wire [duplicate]

I have had this doubt for quite a while and I have tried reading answers to similar questions but I'm still not sure. If I connect a voltmeter at A and B, what would be the reading? Is it going to be ...
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### How does current flow in a Van de Graaff generator?

If a Van de Graaff generator mechanically moves charge from low potential to high potential, then how does the charge actually flow onto the sphere? I'm hearing that a spiky conductor ionizes the air, ...
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### How to know unstable and stable orbit from a given potential? [closed]

A particle of mass $m$ having a non-zero angular momentum of magnitude $l$ is subjected to a central force potential $$V(\vec r)= k\ ln(r)$$ where $k$ is a constant and $r =|\vec r|$, what is the ...
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### Why there is a potential difference only across resistors?

I don't understand why there is a potential difference only across resistors, shouldn't the electrons convert potential energy all the way to the other side of the circuit just like a ball would do ...
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### Two infinite grounded conducting planes at a distance $d$ apart. A point charge $q$ is placed in the region between them. What is the potential? [closed]

What does $\Phi$ means in the solution? Is the coordinate of cylindrical system, then $\Phi=\sqrt{x^2+y^2}$?
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### Why is the potential inside a hollow metal spherical shell with a point charge $q$ at the center equal to $kq/r+kq/b-kq/a$ rather than $kq/r$?

I'm reading Section 20-6 of Tipler's Physics for Scientists and Engineers, where the potential in and around a hollow conducting spherical shell (inner radius $a$, outer radius $b$) with a point ...
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### What is the minimal time to move from the left to the right in a double potential well?

Consider a particle in a double potential well with Hamiltonian $\hat{H}$ and two basis states $|l\rangle, |r\rangle$ which correspond to the particle being maximally localized in the left resp. right ...
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### How does the Fermi level of different materials reach equilibrium when in contact?

I'm a college student studying semiconductors. I can't understand what is happening inside the materials when two or more different materials are in contact. Can I get some help? So, basically at ...
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### Why is the mass term a part of the potential in Quantum Field theory?

I am currently reading the chapter on scalar fields from the book 'Quarks, gluons and lattices' by Creutz and he mentions that "The full potential felt by the [scalar] field $\phi$ includes the ...
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### Why is it selectively OK to rely on intuitive analogues when solving problems in Quantum Mechanics, such as the step potential problem?

I was looking at solved example (3.13) in the Schaum's Series book on QM by Yoav Peleg et al (2nd edn), where they solve for a step potential where a high energy particle is coming from the left and ...
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### How did Feynman derive the potential energy of the ballistic galvanometer?

In the Feynman Lectures Vol 1. Chapter 41 - The Brownian movement, the following statement is present under Section 1 - We know the formula for the kinetic energy of rotation—it is given by Eq. (19.8)...
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### Question about finite difference Method for spherical potential

I don't get how to implement finit difference method for calculating energies in a finite,spherical well. Im frustrated and just changed everything multiple times. But nothing changes. [plot
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### Is capacitance dependent or independent of potential?

The capacity of a conductor is independent of the charge given or its potential raised. However, my textbook states: The principle of a capacitance is based on the fact that capacitance can be ...
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### Potential Difference in Electromagnetic Induction

Is $\int E \cdot \text{d}s$ for a branch having non-zero current $I$ and resistance $R$ equal to $IR$ if the current is induced by varying magnetic field?
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### How can there be two potentials at this point?

In this potentiometer configuration, The blue circled junction has potentials $V$ and $E$ at the same time (Galvanometer shows no deflection), Why is this so? What conceptual error have I made?
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### Potential at a distance $y$ from centre of a uniformly charged disc [closed]

Here, I have attached my try work below. Though I am stuck in integration, but I would like some physics people to answer it. Can I treat the $y\sin\theta$ factor to be constant while doing ...
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