Physics Assignment Help With Current Density

12.2 Current Density

(1) The magnitude of is equal to the current per unit area surrounding that point and normal to the direction of charge flow. Thus,

J =

(2) The direction of is the same as the direction of velocity vector of the ordered motion of positive charge-carriers.

If the current is due to the motion of both positive and negative charges, the current density is given by

=

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