- #1

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because (im not going to use vector notation to save time)

[itex]\nabla \times (B \times r)= (\nabla \cdot r)B + (r \cdot \nabla)B - (\nabla \cdot B)r - (B \cdot \nabla)r[/itex]

the first term gives 3B

the third term vanishes

the fourht term gives -B

so to get the answer i need the second term to vanish but i can't get it to go away - how do i do this?