表V=K Ⅰ=500m4 X(m)00150801004040060130 y(mv) Vu(mv B(7)X(mm) V (mV ) HB ( T ) V (mV ) V0 = K = I m = 500mA 0.00 5.0 8.0 10.0 20.0 30.0 40.0 50.0 60.0 80.0 100. 0 表 1 I H =