Your opinion to the following will be appreciated Lets imagine a sphere made of a conductor (copper) placed within a static magnetic field. The field will penetrate the within the shier. Next we place inside the sphere a coil producing a variable electromagnetic field. The electromagnetic field can not escape out side the sphere due to shielding effect of the cooper sphere. The question is: Taking in consideration the shielding effect created by the variable electromagnetic field within the shier, can the static magnetic field penetrate within the shier?