By W. G. V. Rosser M.Sc., Ph.D. (auth.)

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M. Dirac, Phys. Rev. 74 (1948) 817, but so far, they have not been observed experimentally. (K. W. 6, 122;) Even if they are observed experimentally, it is almost certain that they play no significant role in normal electromagnetic phenomena. However, hypothetical magnetic monopoles can be used to give the reader some interesting problems. S. units. 48) for the force between two stationary magnetic monopoles of strength (qm) 1 and (qmh a distance r apart in empty space. When defined in this way, qm is measured in Webers.

Now AV can be made small on the laboratory scale, say a 10- 7 metre cube, and yet contain many atoms, '" 10 9 for a 10- 7 metre cube. Thus on the laboratory (macroscopic) scale d can be treated as a continuous function of position, since over distances of '" 10- 7 metres, fluctuations due to the discrete structure of matter will average out. The macroscopic mass density is therefore an average mass density, obtained by averaging over a region of space, large on the atomic scale, but small on the laboratory scale.

2 using Maxwell's equations will now be considered from the viewpoint of the theory of special relativity. le, the charge }:' (moves-v relative to E) tEy =217£;;r , ~ t r, =Tt7f7 q ;{ r -1-- 21 I~t I+ I+ I + I + I + I; I + 1+\ iI. 3. The calculation of the electric and the magnetic forces between two convection currents using the theory of special relativity. (a) The charge distributions are at rest in L'; there is only an electric force between the charges in L'. 3(b). 14) ELECTROMAGNETISM AS A SECOND ORDER EFFECT According to the theory of relativity the laws of electromagnetism are the same in all inertial reference systems.

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