Question: A current of 4A flows through a wire forming a "loop" circle of radius r. If the magnetic field in the center of the "loop" is 20 A,
Part A: How long is the radius of the "loop":
A- If the loop consists of one turn wire loop,
B- If the "loop" consists of 10 turns of wire?
I need help to solve the above question and give an explicative process Thanks!