6. (18%) Using the following relation, namely
where A is the surface enclosing the volume △V, expand and explicitly write out ∇• B in spherical r-θ-Φ coordinates. Note that 
. Show all details to get full credit.
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6. (18%) Using the following relation, namely where A is the surface enclosing the volume △V, expand and explicitly write out ∇• B in spherical r-θ-Φ coordinates. Note that . Show all details to get full credit.