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.
Ampere's Law has shown us how currents, moving electric charges, can create magnetic fields. Faraday's Law has shown us how changing magnetic fields can induce an emf in a closed loop. Now we are going to reinterpret Faraday's Law to see how the changing flux induces a nonconservative electric field in a coil.otice that this induced electric field is different from an electrostatic field created by a stationary point charge. When a test charge is moved along any given equipotential surface, no work is done by these conservative fields since the electric force acts perpendicular to the surface.