# Questions tagged [dipole]

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### Energy of Dipole Configuration [closed]

This is a Problem from Electricity and Magnetism by Purcell. I am giving the whole problem as mentioned in the Textbook below. We want to find the energy required to bring two dipoles from infinite ...
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### Dielectric constant of crystals: Feynman's mistake?

Feynman mentioned in his lecture that we can, in some way, obtain dielectric constant of crystals by summing up the electric field due to dipoles. For example, equation (11.33) from above link shows ...
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### Constellation of charges in a quadrupole

I’d like to know if any constelation of 4 charges is a quadrupole. I have a task where there are 2 positive and 2 negative charged particles in the corners of a rectangle. And this is a quadrupole. Is ...
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### Force on a magnetic dipole

How to deduce the force on a magnetic dipole given by $F = \nabla(m \cdot B)$ from the Lorentz force?
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### The physics behind DC voltage derating of capacitance

I don't understand this phenomena pointed out in LDO's Capacitor vs. Capacitance where it says: Given the dynamic nature of capacitors (storing and dissipating electric charge in a nonlinear fashion),...
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### Energy of magnetized vs not magnetized ferromagnet?

A ferromagnet conststs of many, many microscopic magnetic dipoles that can be pointed in different orientations. If the ferromagnet is not magnetized by applying an strong external magnetic field, the ...
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### Magnetic field around a magnetic dipole and circular current loop

Qualitatively, how does the magnetic field around an ideal dipole compare with the magnetic field around a circular current loop?
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### Why is the external torque not taken as -$pE\sin\theta$ in the derivation of the Potential energy due to an external field

So in the derivation of the Potential energy of a dipole due to an external field, we consider a dipole with charges $q_1= +q$ and $q_2= –q$ placed in a uniform external electric field. We know that ...
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### If dipole moment is a vector $q×d$, then is charge a vector?

If I am right you can only do vector product for vectors. Here you have dipole moment $= q×d$. Then are we assuming charge is a vector? But how then does charge obey the triangle law of vector ...
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### Do EM waves produced by a dipole antenna propagate along 1 plane?

The plane would be perpendicular to the dipole and passing through it. Do em waves propagate in all directions of that plane or in any direction of any plane?
Consider a dipole ($\vec{p}$) in an electric field ($\vec E$) making an angle $\theta$ with the field. We can see that $V_1-V_2=Ed\cos\theta$ In books, the derivation for the interaction energy of ...