What is the dot in i called?

That "dot" is called a tittle or a superscript dot . A tittle or a superscript dot is a small distinguishing mark, it shows in the lower case letter(s) i or j. The tittle is an integral part of the glyph of i and j, but diacritic dots can appear over other letter in various languages.

i don’t know your in college god damit

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).