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I know that for an infinitely long current carrying wire, the magnitude of the magnetic field is given by (mu_0*I)/(2*Pi*R) where mu_0 is the magnetic permeability of free space.

What I would like to know is what is the vector form of this equation? i.e. How can you determine which way the B-field points? I've looked all over the internet but can't find anything! Does there need to be a cross product with r-hat in there somewhere!