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3. I know all the formulas needed, but do not know what the B field would be. Do i use spherical co-ords? In which case B would equal ( [tex]\frac{\mu}{4\pi}\frac{2M}{r^{3}}cos\theta[/tex] , [tex]\frac{\mu}{4\pi}\frac{2M}{r^{3}}sin\theta[/tex] , [tex]0[/tex] ) where M is the magnetic moment of the earth? Then put R=([tex]R[/tex] , [tex]0[/tex], [tex]0[/tex] )? Or am i on the wrong tracks entirely? Any hints greatly appreciated.