I want to solve a system of differential equations in comsol multiphysics.
So far I have not figured out how to enter a 2nd pde in addition to the existing pde.
Is this possible, and how?

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The problem is to solve for the magnetic field distribution inside the superconducting region of a superconductor surrounded by air where an external magnetic field is applied. In each region (superconductor+air) the problem is described by two differential equations. Comsol multiphycis PDE pack contains predefined general forms of PDEs but only one PDE is pre-defined for each region. I need to enter my 2nd PDE in each region in order to describe the problem properly.

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Edit note, Multiphysics platforms are CAD systems, that add an infraction of virtual problem solving variables, to a standard or nonstandard problem format, in wide field problem solving and engineering.

Examples might be, {if a slow flow of a constant mass of water, if traveling over a series of five floor propellers, then what would be the rough mixture completions ratio, of an infiltrated mixture, to be added to a constant stream, at n molar values}.?

There is no answer, this is an example, however shows an adjustive rate capacity, housed within a platen of needed to add variables, would lend to a proposed output.

I am trying to simulate something supposedly simple in COMSOL but am not getting anywhere as I am a complete beginner. Where can I find help? I.e. someone who can eventually walk me through or provide me with tutorials other than the Integrated Circuit Example provided in the booklet that comes with the program?

I am trying to simulate light traveling through a 2D system of translucent polymers, with the electromagnetic waves propagating parallel to the screen plane.

It would be great if you could help me there, I am currently quite overwhelmed by the program.

Thank you very much