# Tag Info

-2

perfect dipoles means forces at center of dipole is zero

0

TLDR: The external electric field through the dielectric causes small displacements on the bound charges of the dielectric. These accumulate as an induced surface charge on the dielectric/vacuum interface. The total electric potential is then given as a sum of the external potential, the induced potential of the induced point-like dipole, and the induced ...

0

Let me try to offer a different way to see it based on linearity. Note that your two links are reversed in the situation they consider; your second link has the dipole embedded in the dielectric embedded in vacuum, whereas your first has the dipole in a vacuum embedded in a dielectric. So, equation (3) contains an $\epsilon$ where it should have ...

0

So I am not aware whether you have regarded the previous answer properly or you know about this, but there is a uniqueness theorem for the solution of the Poisson equation. Thus this solution is already correct because you have solved the boundary problem: You have found a solution for the Laplace equation in the area where no free charges exist ...

0

In general, no justification needs to be made - we can assume whatever we want. If a solution which satisfies both the equations and the boundary conditions is found, it is the only solution. By focusing on a subset of all possible solutions, we can make solving the problem much easier. Now, as we have "guessed" the form of solution (so that the equations ...

1

In general, no: the field of a charge distribution $\rho$ is not the same as the field of a point charge at some point therein, except for some very particular cases (the one that everyone should know is that any spherical shell of charge has an inner field of 0 but an outer field that looks exactly like all the charge is located at the center point. A ...

1

The heart only acts as a big dipole, when it is electrically active. ECG measures the potential difference between different places on the skin. These potential differences are created when different parts of the heart muscle are in dfferent stages of their action potential. For example, when the septum and the subendocardial myocytes are depolarized, but ...

Top 50 recent answers are included