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Choose the correct expression for the po...

Choose the correct expression for the pointing vector`vec S` in free space. (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 = ( vec B . vec E)/µ_0`

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