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

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Page 120

This equation is interpreted as the conservation of

of the region represented by c the surface integral on the left. Thus the vector ...

This equation is interpreted as the conservation of

**energy**principle — the loss of**energy**in the region of integration is just the**flux**of**energy**through the boundaryof the region represented by c the surface integral on the left. Thus the vector ...

Page 122

This term is independent of the existence of charges or currents and is

nonvanishing even in vacuum provided the

We interpret it in the following manner — the part causes a momentum change of

matter ...

This term is independent of the existence of charges or currents and is

nonvanishing even in vacuum provided the

**flux**of electromagnetic**energy**exists.We interpret it in the following manner — the part causes a momentum change of

matter ...

Page 148

All the above calculations of

through in an exactly similar manner for the TE modes leading to equations (27),

(28) and (29) where only E is replaced by B. Equation (30) is thus generally true.

All the above calculations of

**energy flux**and energy per unit length can be gonethrough in an exactly similar manner for the TE modes leading to equations (27),

(28) and (29) where only E is replaced by B. Equation (30) is thus generally true.

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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