2. Ampere' s Law in a medium有介质时的安培环路定理 Take the long solenoid(长直螺线管) as an example: o000oooooooooo l0 00oo Bo=HonI 8888888888888888888 日;■ B 8888×888X××8×888 B=,B6=/m2. Ampere’s Law in a Medium 有介质时的安培环路定理 Take the long solenoid(长直螺线管） as an example: • P  B0  0 I B nI 0 = 0 • P  B  0 I B B nI =  r 0 =  s j