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

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Page 80

As there is no electric field in the body of the

decreased by an amount e(£2/8jt)ds.dl by this virtual displacement. Hence the

force per unit area of the surface of the

the ...

As there is no electric field in the body of the

**conductor**, the field energy has beendecreased by an amount e(£2/8jt)ds.dl by this virtual displacement. Hence the

force per unit area of the surface of the

**conductor**is e E2 /8n. As at the surfacethe ...

Page 99

In the second case we call it conduction current and it lasts so long as there is an

electric field in the

condition). Ohm's law states that for a given

is ...

In the second case we call it conduction current and it lasts so long as there is an

electric field in the

**conductor**(which of course indicates a basically non-staticcondition). Ohm's law states that for a given

**conductor**the current density vectoris ...

Page 135

This time, called the relaxation time, has a small value for good

take copper for example a = 5 x 10" and for the moment taking the dielectric

constant to be of the order of unity, the relaxation time comes out as -10 19 sec

which ...

This time, called the relaxation time, has a small value for good

**conductors**. If wetake copper for example a = 5 x 10" and for the moment taking the dielectric

constant to be of the order of unity, the relaxation time comes out as -10 19 sec

which ...

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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