Notes 1 Spring 2005

Notes 1 Spring 2005 - Notes 1 Spring 2005 Introduction to...

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Notes 1 Spring 2005.doc Introduction to Electromagnetic Theory : - There are four basic forces of nature: 1. electromagnetic force 2. strong nuclear force 3. weak nuclear force 4. gravitational force - It is theorized that all four are actually manifestations of one force. A quantum theory of gravity is required before this can be proven and something called string theory attempts to do so. - The mathematical form of the static gravitational force and the static electric force are identical for point charges/masses: 2 2 1 e r q q k F G G = 2 2 1 g r m m G F G G = - However, the gravitational force is always attractive * (mass is always greater than or equal to zero), but the electric force can be either attractive or repulsive (charges can be positive or negative). - What are these forces? The word force is used to describe some intangible thing that causes something else to want to move; the Newtonian formulation is, of course, a m F G G = . - The value of charge on a particle (or object) is a number that we use to describe a certain characteristic of the particle that manifests itself through the application of an electric force upon another charged particle (object). In the SI unit system the basic unit of charge is C 10 6 . 1 19 × (the magnitude of charge on an electron or proton). - The value of mass is a number that we use to describe a certain characteristic of a particle (or an object) that manifests itself through the application of a gravitational force upon another massive particle (object).
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