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Chapter Three CURRENT ELECTRICITY
Electricity 97 E l = j ρ l or, E = j ρ (3.11) The above relation for magnitudes E and j can indeed be cast in a vector form. The current density, (which we have defined as the current through unit area normal to the current) is also directed along E, and is also a vector j (≡≡≡ j E/E). Thus, the last equation can be written as, E = jρ ...
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