If your equation is in vertex form, then the axis of is: x= h in the general vertex form equation y = (x-h)2 + k. If your equation is in standard form, then the formula for the axis of symmetry is: $$ x = \frac {-b}{ 2a} $$ from the general standard form equation $$ y = ax^2 +bx + c $$.
Lesson Summary. All magnetic fields are created by moving charged particles. Stationary charged particles do not generate magnetic fields. An electromagnet is a magnet that relies on an electric current to produce the magnetic field. The simplest electromagnet is simply a wire carrying a current, which generates a magnetic field all around the wire.
Best Answer: Depends on the motor, but you'll always have a loop, or several loops, of wire changing their orientation with respect to the motor's field magnets. If the motor's field is supplied by permanent magnets you'll get a bit of voltage across the motor leads. In an induction motor and most other motors you won't, because the fields are supplied by electromagnets.