I made a new web page to describe/define the electric field 4-vector to someone. I thought I'd post a link to that page here. Some of you might find it interesting since most people only think of the electric field as being only the components of a 2-tensor. See(adsbygoogle = window.adsbygoogle || []).push({});

http://www.geocities.com/physics_world/sr/efield_4vector.htm

This is similar to theenergy measured by observerdefined as follows

Let U_obs be the 4-velocity of an observer. Let P be the 4-momentum of a particle. Then the scalar product of the two is called E_obs = energy measured by observer

E_obs = P*U_obs

In some sense of the term this can be viewed as an invariant scalar. In any case E_obs is a tensor of rank zero and is therefore a scalar by definition. Like wise E^a = F^ab U_a is the electric field 4-vector as measured by the observer whose 4-velocity is U.

Pete

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# Electric Field 4-vector

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