Demystifying Electromagnetic Equations: A Complete by Douglas L. Cohen PDF

By Douglas L. Cohen

ISBN-10: 0819442348

ISBN-13: 9780819442345

In classical Newtonian mechanics, equations and formulation by no means switch shape. a similar can't be stated approximately equations and formulation of electromagnetic thought, which frequently switch shape whilst switched over from one method of devices to a different. Douglas Cohen presents precisely what the technical expert wishes: an intensive rationalization of ways to transform electromagnetic equations from one process of devices to another.

Contents

- Preface

- define of Non-Electromagnetic platforms of devices

- devices linked to Nineteenth-Century Electromagnetic thought

- devices linked to Twentieth-Century Electromagnetic concept

- usual Shortcuts Used to rework Electromagnetic Equations

- Bibliography

- Index

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Extra resources for Demystifying Electromagnetic Equations: A Complete Explanation of EM Unit Systems and Equation Transformations

Sample text

11), the solution given in Eq. 33a) where ω= k . 33b) We have already found the dimension of ω to be time−1 . Often an oscillatory function, such as sin(ωt) in Eq. 33a), is written as sin(2πf t), where f is a pure frequency : f= 1 ω = 2π 2π k . m Since 2π is dimensionless, the dimension of f is also time−1 . To distinguish ω and f , the units of ω are often given in the cgs and mks systems as rad/sec instead of just sec−1 . A pure frequency f is then given in hertz (Hz),∗ defined as sec−1 in the sense of cycles per sec, where cycle is another dimensionless unit.

32. 35b) 30 C HAPTER 1 The first step in turning R into 1 is to create a unit of temperature, which we call degR1, in which the numeric part of R is 1. 36) then Rule I can be used to convert the temperature units of R to degR1: R = RmksK joule joule joule = RmksK =1 . 37) In Eq. 37) we have dropped the mole because we are treating it as dimensionless. We define the mksR1 system of units to be the same as the mksK system of units, but with temperature measured in degR1 instead of degK. 38a) mksR1 and U (R) = mksR1 joule .

For example, when setting c = 1 we stop recognizing the separate dimension of time and instead give it the dimension of length, making the sec a connecting unit and the cm an invariant unit. We could, however, re-do this conversion by no longer recognizing the separate dimension of space, instead giving it the same dimension as time. The conversion formulas would end up the same, as would the physical equations, but now the sec (and other units of time) would be invariant units, and the cm (and other units of length) would be connecting units.

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Demystifying Electromagnetic Equations: A Complete Explanation of EM Unit Systems and Equation Transformations by Douglas L. Cohen


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