A.45,000A; B.18,000A; C.需要更多的數據才能計算; D.1,125A
A.I=r²H/2; B.I=5²r²H; C.I=10²r²H; D.I=π²r²H/2
A.剩磁法; B.復合矢量磁化法; C.連續(xù)法; D.波動法