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The current density at a point isvecj = ...

The current density at a point is`vecj` = `(2xx10^(4)hatj)Jm^(-2)`. Find the rate of charge flow through a cross sectional area `vecS` = `(2hati +3hatj)cm^(2)`

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The rate of flow of charge = current = I=`intvecJ.dvecS` `rArr` I=`vecJ.vecS`=`(2xx10^(4))[hatj.(2hati+3hatj)]xx10^(-4)A`=6A
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