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 fields created by different sources, e.g., by two or more point charges, simply add together as vectors. Similarly magnetic fields created by different sources, e.g., by two or more current-carrying wires, also add together as vectors.This superposition principle applies to all electric and magnetic fields, including those comprising electromagnetic waves created by different sources.lectric fields created by different sources, e.g., by two or more point charges, simply add together as vectors. Similarly magnetic fields created by different sources, e.g., by two or more current-carrying wires, also add together as vectors.