A set of equations , which includes electric and magnetic fields , and their sources , order and current densities , are known as_______equations.

Maxwell

The correct answer is option 4. Maxwell.

A set of equations that includes electric and magnetic fields, as well as their sources, charges, and current densities, are known as Maxwell's equations.

Maxwell's equations are a set of four fundamental equations in classical electromagnetism, named after the Scottish physicist James Clerk Maxwell. These equations describe how electric and magnetic fields are generated by charges, currents, and changing magnetic fields. They are essential for understanding the behavior of electromagnetic waves, such as light, and for predicting the behavior of electric and magnetic fields in various situations. Maxwell's equations unify the concepts of electricity and magnetism and form the basis of classical electrodynamics.