填空题
A.磁场强度大小为H=NI,磁感应强度大小为B=μ0μrNI B.磁场强度大小为H=μNI/l,磁感应强度大小为B=μ0μrNI/l C.磁场强度大小为H=NI/l,磁感应强度大小为B=μrNI/l D.磁场强度大小为H=NI/l,磁感应强度大小为B=μ0μrNI/l
A.A B.B C.C D.D