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The current density (J) at cross-section...

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

A

`(12 muA)`

B

`(8 muA)`

C

`(4 muA)`

D

Zero

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