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.
Motors are based on these facts about magnetism. An electrical current is just a bunch of moving electrical charges. Therefore if you place a wire carrying a current in a magnetic field, there will be a force on the wire, and the wire will move. By arranging everything in the right way, you can make a motor.lectric motors use both electricity and magnets to create motion. The incoming electricity provides the power and generates magnetic fields which convert the power into motion. Motors are basically the opposite of generators. One uses electricity to generate motion and the other uses motion to make electricity.