The magnetic field density B is proportional to the current.
the field is normal to the area of the loop. In electromagnetic, you learn if you pass current through a wire loop, you create a magnetic field. Loop area is something that a lot of people do not get into but is very important. A lot of pcb designers are being pushed out because they don't have the knowledge on signal integrity.even though they are expert on Allegro. Find one that is popular, have support, board house can read. They all can do the job, they all have strong and weak points. I learn quite a few professional CAD tools like OrCad, PADS power pcb, Eagle etc. I am an engineer, but I was in charge of pcb layout people, I layout pcb for years. Then you have by pass caps location to control current loops.That's where you should spend all the time learning instead of worrying about the pcb tool. There are different philosophy on this topic, star has it's place for high current path, ground plane has it's place of small loop area for suppressing crosstalk. But it's just too much to read if you only word with audio. I don't think you can find one only talking about audio frequency as it's really not that popular. You can write a book on this.Oh yeh, those are part of the signal integrity issue that they have books. You really need to understand electronics to do that, there is no one answer. This kind of question is beyond most pcb designers.
Learning the importance of power and ground.
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