## Classical theory of electricity and magnetism: a course of lectures |

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Page 7

2 Direct calculation of

The next in simplicity is an arrangement of two equal and opposite charges

separated by a distance. We shall consider the separation between the charges

to be ...

2 Direct calculation of

**field**in some cases A**point**charge is called a monopole.The next in simplicity is an arrangement of two equal and opposite charges

separated by a distance. We shall consider the separation between the charges

to be ...

Page 92

That Br and B vanish may be seen by combining symmetry consideration with the

field equations. 4 Bz . dl = I ... Hence the change -d0m may be thought to be

brought about by a translation of the coil through -dr, the

fixed.

That Br and B vanish may be seen by combining symmetry consideration with the

field equations. 4 Bz . dl = I ... Hence the change -d0m may be thought to be

brought about by a translation of the coil through -dr, the

**field point**remainingfixed.

Page 172

It is tempting to give an interpretation of this equation on the basis of the idea that

the influence from the source to the

and takes a finite time in the passage. This is of course a necessary requirement

...

It is tempting to give an interpretation of this equation on the basis of the idea that

the influence from the source to the

**field point**travels through intervening spaceand takes a finite time in the passage. This is of course a necessary requirement

...

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### Contents

The empirical basis of electrostatics | 1 |

Direct calculation of fields | 7 |

dipoles9 The Dirac 5function13 | 13 |

Copyright | |

23 other sections not shown

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acceleration angle angular axis boundary conditions calculate called centre charge density charge distribution charged particle coefficient coil components conducting conductor consider coordinates dielectric constant differential dipole direction distance divergence electric and magnetic electric field electromagnetic field electromotive force electron electrostatic energy flux equation 16 expression field due field point finite fluid formula Fourier frame frequency function given gives Hence incident infinite interaction isotropic Laplace's equation linear Lorentz transformation magnetic field magnitude Maxwell's equations medium molecule momentum motion number density obtain orthogonal oscillations permanent magnets perpendicular photon plane plasma point charge polarization potential due Poynting vector radiation field radiation reaction radius refractive index region relation result satisfied scalar shows sin2 solution special theory sphere at infinity spherical surface integral symmetry tensor term theorem theory of relativity transverse uniform vanishes vector potential velocity volume wave length write zero