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1、 Next fill the solenoid with some material and then measure again the magnetic field in it when the same current is led in the coils (Fig.16.1(a) . Let B0 and B be the magnetic field measured in the two cases respectively. Experimental results show that the two differ from each other and can related
2、 as 0rB B (16.1) (16.1)0rB B (16.2) 0 0+ B B B nI j 0rB nI 1rj nI 1rj nI 0 0,0 0,0 0 01 in inC Cr IB dr B dr I (16.3)0/ /rH B B (16.4)0,in C H dr I (16.5) 2C H dr rH I 2IH r 02r IH r If the ferromagnetic materials is made to have a hollow interior, such as an iron box , the magnetic field lines woul
3、d be collected in the iron wall as shown in Fig. 16.5In the hollow space in the box ,the magnetic field would be very weak . Thus when something is put in the closed box . It will not (or only slightly) be affected by external magnetic fields . This is the principle of magnetic shielding using iron box. 0rB B 0/ /rH B B 0,inC H dr I
磁性材料的特性
