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bon
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Homework Statement
Ok well all I am told in the question is that the magnetic field B at a distance r from a straight wire carrying current I has magnitude uoI/2pi r..
The lines of force are circles on the wire and in planes perpendicular to it..
Show that divB = 0
Homework Equations
The Attempt at a Solution
So I've not actually done any electromag, but it should be possible to do the question without it...
Im just unsure on how to write the vector B..i.e. how can i write it down in vector form using the information theyve given me?
thanks :)