The current density vecJ at cross sectio...

The current density `vecJ` at cross sectional area `vecA`=`(2hati+4hatj)` `mm^2` is `(2hatj+2hatk)` A `m^(-2)` . The current following through the cross-sectional area is

`12 muA`

`8 muA`

`4 muA`

Zero

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