 Quote by Q-reeus
Clear by now surely that L is normal to applied E. And btw, just as clearly, relative velocity (re gamma factor) is also taken as normal to E, hence along the same axis as L.
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Well, it's clear now that you've said so. So now my question is, how is L measured? Since it's normal to E, it isn't linked directly to something obviously physical like the distance between the capacitor plates. So how is L measured?