What is auxiliary verb​

The verb which is used in beside of main verb

is, am, are, be, been, being, can, could, did, do, dose, had, has, may, might, must, need, ought to, shall, should, was, were, will, would.

now you can make him brainleist.              

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).