Como seria "olha cara eu até tenho, mas não dá" em Inglês?

first one is your answer

~coco

fearlessness is your answer

we need to see the examples!

the direction of the magnetic field produced by an electric current will change when the direction of the electric current changes. for example : if a current is flowing in a straight length of wire, the magnetic field is described by a concentric circle (using right-hand rule).