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- Thread starter mr_coffee
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[tex]\Phi_{E} = \vec{E} \cdot \vec{A}[/tex]

So, when you evauluate that and you multiply the j components, you get 3 x 0 which is of course 0. That's the same reason that b. is 0, because [itex]\vec{A}[/itex] has no k component and [itex]\vec{E}[/itex] has no i or j components.

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ohh!! i forgot all about that, i have to refresh on vector math! thanks!

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