Hi I have a question regarding mu-metal, which I haven't beem able to find the answer to online. Say I have a current loop placed enclosed in a cylindrical magnetic shield made of mu-metal as shown in the attachment (red loop is the current loop). The shielding will prevent any B-field to penetrate it, but wont it also act as a "B-field mirror", i.e. it will basically appear to a particle inside the shield that there are three coils: 2 with oppositely directed currents to the actual, physical one? Best, Niles.