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.
Electric and magnetic fields (EMF) are invisible lines of force generated by natural phenomena such as the earthâs magnetic field or lightning. EMF are also produced by electricity and other man-made sources that we are exposed to in our daily lives like household appliances, computers and cell phones. In fact, EMF surrounds all things electrical. When electric current flows through a conductor, it produces both an electric field and a magnetic field.