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

By Douglas L. Cohen

In classical Newtonian mechanics, equations and formulation by no means swap shape. an analogous can't be acknowledged approximately equations and formulation of electromagnetic idea, which regularly swap shape whilst switched over from one approach of devices to a different. Douglas Cohen presents precisely what the technical expert wishes: an intensive clarification of the way to transform electromagnetic equations from one procedure of devices to another.

Contents

- Preface

- define of Non-Electromagnetic structures of devices

- devices linked to Nineteenth-Century Electromagnetic concept

- devices linked to Twentieth-Century Electromagnetic concept

- ordinary Shortcuts Used to rework Electromagnetic Equations

- Bibliography

- Index

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

Sample text

48a) 36 C HAPTER 1 If T[liter·atm] is truly the numeric part of the same temperature in the C system, then we must have ? T[liter·atm] = T[EdegR1LA] . Substitution of Eq. 46b) into Eq. 0821T[degK] . 48b) Comparison of Eqs. 48b) shows that T[liter·atm] is indeed the same number as T[EdegR1LA] , so the temperature unit EdegR1LA is indeed the same as the temperature unit we get using Rule I to go directly from C to C in Fig. 3. —we use to measure it. It is straightforward to return Eq. 45), P V = nT , to its original form.

The first step in removing the speed of light is to choose units of length and time such that the numeric part of c is 1. 99792 × 1010 . 55b) ∗ Although it would be a digression to get into the details of special relativity, we can note that the momentum in Eq. 54c) becomes infinitely large as the velocity gets ever closer to the speed of light. One basic property of a force in physics is that it increases the momentum of moveable objects. 54c) suggests we can apply an arbitrarily large force an arbitrarily long time—increasing the momentum to an arbitrarily large value—without ever accelerating an object up to the speed of light.

The coulomb unit of charge is explained in Chapter 2. 67c) O UTLINE OF N ON -E LECTROMAGNETIC S YSTEMS OF U NITS 47 −1 sec from Eq. 56a), we can write, going from the cgs to Using 1 cmtime3 = ccgs the cgc system, gm · cm2 sec2 2 −2 · gm · cm . 68a) Changing over to the cg system gives 1 eV2 = 107 e[coul] · gm. 68b) Thus a mass m in gm, m = m[gm] gm, becomes, working in the cg system of units and using Eq. 69a) . 11 × 10−28 gm, transforms using Eq. 3 MeV2 . 60218 × 10−12 As with ergs, it is customary to neglect the difference between eV3 and eV2 , relying on context to show which type of energy units are being used.

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