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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

A

`12 muA`

B

`8 muA`

C

`4 muA`

D

Zero

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