# 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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### How does an electrical circuit works? [closed]

I am not getting how Electrical circuit works? what do we mean when we say potential difference of battery across the terminal? Is it the work done by electrical field created by the two terminals of ...
1 vote
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### Laplace's equation in presence of a dipole

I know that in classical electrodynamics we're dealing with stuff macroscopically, so I can pretend that some volume of space is empty of charge when it's actually full of matter consisting of charged ...
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### What is the point of the four different thermodynamic potentials?

Why are there four different thermodynamic potentials? What is the point? Nothing new is defined, just a reshuffling? Could someone help me in showing this? Does it relate to doing experiments? If I ...
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1 vote
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### What causes the potential difference in a half-cell?

This question pertains to the subject of electrochemistry --specifically a half-cell and not a full galvanic cell. From what I understand, a half-cell has a potential of its own. This is voltage is ...
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### How does the potential difference between two points in an electric field be the work done?

I was learning about electric potential and it was pointed out by my professor that the potential we calculate between two points is the potential difference and not the absolute potential; if ...
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1 vote
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### Finite Potential well inside an infinite potential well

Let us consider the following potential $V(x)$ such that $$V(x) = \begin{cases} 0&0<x<b \\ V_0&b<x<a \\ \infty&x>a \\ \end{cases}$$ And we have $V(x)=V(-x)$. We are ...
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### The capacitance of an isolated spherical conductor

I just started my topic on capacitance today. In the above derivation of capacitance of an isolated conducting sphere,+q charge is distributed uniformly. After substituting the value of potential, we ...
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### What does negative electrical energy signify?

When we derive the formula for potential energy caused by the torque of a dipole in uniform electrical field we get $U = -pE \cos \theta$. And my textbook tells me that the when the dipole is kept ...
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### Working of a van de Graaff generator

Experiments show that when a charged conductor is placed in contact with the inside of a hollow conductor, all the charge on the charged conductor is transferred to the hollow conductor. In principal ...
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### Current without potential difference, in the given circuit?

In the given circuit, the value of current comes out to be 0.5 A Now if I calculate potential difference between point A and B i.e. $$V_B + 3i-1.5=V_A$$ On putting value of $i=0.5A$ we get, V_A-V_B=...
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### Why is current density in a conductor of uniform cross sectional area constant at all points?

According to what I was taught, if current was dispersed “uniformly,” current density would remain constant. So, in a conductor, the 'current density should be the same at all points.' But, given that ...
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### Is electric potential inversely proportional to the voltage at a point?

Consider this simple diagram, where the thermistor's resistance = $500\Omega$. Let's suppose the temperature of the room increases. Then, Electric potential at point ...
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### Deriving non-relativistic potentials from QFT

Some systems, like atoms, are described well by quantum mechanics, where one just gives the Hamiltonian in the form $H=T+V$ and computes the eigenvalues and eigenvectors of this operator to figure out ...
### Conducting shell surronded by, dielectric shell, and an outside $q$ charge
I would like some help with my solution attempt. I have a conducting shell with radius $R1$, surronded by a dielectric shell with $\varepsilon_1$ and radius $R2$, and on the outside i have a $POINT$ \$...