By P. Hammond
This can be a totally revised and up to date version of a known introductory textbook on electromagnetism. It covers all of the primary features of this crucial subject in electric engineering. The method is eminently sensible and calls for little arithmetic except common differentiation, integration, and trigonometry. it's going to proceed to entice scholars learning this conceptually tough yet basic topic. New sections on electromechanics (conversion of electrical and magnetic power in mechanical strength and vice versa) and high-frequency phenomena (transmission traces, waveguides, optical fibres, and radio propagation) increase the usefulness of the publication
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Extra info for Electromagnetism for Engineers. An Introductory Course
It follows that capacitance is increased by connecting capacitors in parallel and capacitance is reduced by connecting capacitors in series. 9 47 THE FORCE ON A CHARGED CONDUCTOR The force on a charged conductor is of course the force on the charges on the surface of the conductor. In electrostatic problems the force on these charges is always perpendicular to the surface of the conductor. A force along the surface would move the charges, but this is not permissible since electrostatics deals with the situation that exists after the motion has ceased.
Yet curiously enough the idea forms one of the most useful weapons in the armoury of an electrical engineer. If all our apparatus consisted of beautifully symmetrical bodies such as spheres and cylinders, we could solve our problems by analysis, using Gauss's theorem and symmetry. But generally the apparatus is of varying shape and we have to make use of numerical methods rather than neat equations. Happily, computers can be used to take the labour out of such methods, but before the information can be fed to the computer the problem has to be broken into small pieces.
The action of the electric field is then to align the dipoles which originally point in all directions. The resulting effect is again that shown in Fig. 3,14. Consider now a parallel-plate capacitor with an insulating material between its plates (Fig. 15). Let Q be the charge on the metal plates and q the induced + + + + + + FIG. 14 A polarized dielectric 42 E l e c t r o m a g n e t i s m f o r Engineers ^ ^ ^ ^ ^ +Q 1^ ^ ^ ^ ^ q — 1^ — ^ FIG. 15 Parallel-plate capacitor with dielectric surface charge on the insulator.