# 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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### Numerical calculation of electric field in dielectric medium

I want to numerically calculate the electric field between two parallel plates with finite length. Where parallel plates are connected to source of constant potential difference: I have boundary ...
20 views

### Calculation of Average Position for Particle in Infinite Potential Well [closed]

I am working on a problem involving the calculation of the average position for a particle confined to an infinite potential well. The ground state wave function � ( � ) ψ(x) is given by: � ( � ) 2 � ...
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### We have calculated the gravitational potential due to a disc or ring at its axis || My challenge to all physics lovers, calculate it at height h above [closed]

It is a given disc with a defined mass, radius and mass per unit length. Assuming disc's centre to be origin (0,0). Find the gravitational potential due to disc at point a(x, h). Please don't classify ...
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### Equation of a equipotential surface

I have been trying to find a equation for the equipotential surface of a dipole , so I started with a simpler system of a singular charged particle , here are few things I know about the equipotential ...
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### Why does the capacitance of a capacitor depend on charge and potential?

The formula of capacitance is $$C = \frac{Q}{V}.$$ So the capacitance of a capacitor should depend on the charge and potential but it doesn't. Why?
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### How to transform the volume integral of a curl of the product of a potential with a magnetic field into a surface integral?

Problem 6.5 of Jackson electrodynamics says: A localized electric charge distribution produces an electrostatic field, $\vec{E} = - \vec{\nabla}\Phi$. Into this field is placed a small localized time-...
318 views

### Sign of shaft work done when piston moves upward

If the piston shown above moves upwards a distance 1 m the shaft work (according to the textbook solution to a related problem) is 1334 J. Shouldn't the sign of work be negative because the shaft ...
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### Potential due to initially uncharged induced conductor?

From Griffiths' Introduction to electrodynamics: In this problem, Griffiths says that we will set the potential inside and on the surface of the conductor to be zero since its an equipotential ...
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### Will the potential on surface of a irregular conducting sphere surface be constant?

We know that potential on surface due to a regular conducting sphere is constant. But what will it be when the surface is irregular and charge distribution is non-uniform?
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### Why doesn't charge accumulate in a loop?

When learning about electromagnetism at my university, electricity flow is generally shown as a conductor with a high potential at one end and a low potential at the other and thus charges flowing ...
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### Circuit without grounding

I'm learning about the notation of grounding. In this post of Wikipedia, https://en.wikipedia.org/wiki/Floating_ground, it is said that Conductors are also described as having a floating voltage if ...
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### Parity of a bound state determined by potential

Some time ago in my QM class, we were working with an infinite well potential, and my professor told us we could know beforehand the bound states we were going to obtain for said potential would have ...
1 vote
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### Sign Problem When Calculating the Potential of an Infinite Line Charge [duplicate]

Similar questions have been asked before in the forum regarding the sign problems when integrating the electric field, but they do not fully clarify the problem for me, so I just want to ask for some ...
514 views

### Why do we use negative sign for electric potential/voltage?

Negative sign is used for electric potential belonging to negative charge but whenever in electrostatics the "negative" sign is referencing for example: force means its attractive or ...
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### Electric potential inside a conductor due to a point charge outside the conductor

I am a highschool student. I recently learned about conductors with cavity in school. How does a point charge outside the cavity, kept at a certain distance from the conductor, affect the potential of ...
1 vote
655 views

### The link between two definitions of "potential density"

In Kundu's book , 4ed, P21, they define the potential density $\rho_\theta$ like this: However, later in P22, they define the potential density gradient as It seems to me that the potential density ...
1 vote
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### Charged plasma and ion grid in interaction in ion thrusters

I was just wondering ..... In this Image of an ion thruster, when the positively charged particles pass through the grids, wouldn't they just bombard the negatively charged grid(a fraction of them). ...
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### Potential difference between electrolyte and electrodes in terms of electrostatics concept

As a high school student studying electrostatics, I understand that the electric potential at a point closer to a charged particle, is nearly infinite, then why there exist a finite potential ...
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### CMB anisotropies due to moving clusters/voids?

Apparently, there is an effect where a moving overdensity/underdensity (or an object, e.g. a galaxy, moving in an overdensity/underdensity) that is going through an evolution of its gravitational ...
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### How do we define electromotive force and potential difference in terms of energy transfer between energy stores?

I understand that energy is transferred electrically from the chemical potential store in the battery to internal store of the resistor. How do we include the energy transfer in the definitions of ...
1 vote
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### Defintion of gravitational potential

I am not much clear regarding the defintion of "gravitational potential": Is the work done for bringing the unit mass from infinity to that point by, gravitaional force or external force? (...
1 vote