ROOT WORDS OF CERTAINTY

i think the best answer would be d allowing 30 seconds between response would give time for what was already said to sink down in your mind.

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).

depressed people should not argue