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The poynting vector in vaccum is represe...

The poynting vector in vaccum is represented by (where symbols have their usual meanings)

A

`vec S = (vec B x vec E)/µ_0`

B

`vec S = (vec E x vec B)/µ_0`

C

`vec S = (vec E . vec B)/µ_0`

D

`vec S = (harr vec B . vec E)/µ_0`

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