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current density
subjectfact 
current densityhas definition Amount of charge passing through a unit area per unit time.has source: Hopkins, J. 1976 Glossary of Astronomy and Astrophysics, University of Chicago Press, 2001-09-27 09:33:16.0
is a kind of electromagnetic quantity2001-09-27 09:33:16.0
quantityhas unit2001-09-27 09:33:12.0
numberhas value2001-09-27 09:32:57.0