实验12 用冲击电流计测量磁场

1、实验12 用冲击电流计测量磁场一、 实验目的二、 实验仪器三、 实验原理四、 实验内容与步骤五、 数据处理根据课本中（3.12.1）可求得磁场强度H，（3.12.3）可求得磁感应强度：B。得下表：B/mT172.7168.2163.1158.0151.3143.8134.7124.8112.7I/mA600.8548.9498.4452.3400.5350.4298.5250.2198.2H/A/m4986.644555.874136.723754.093324.152908.322477.552076.661645.06B/mT99.884.875.063.550.335.722.35.4-

2、0.6I/mA150.099.769.936.50.0-38.2-72.4-114.6-129.0H/A/m1245.00827.5580.17302.950.00-317.0-600.92-915.18-1070.7B/mT-9.6-31.5-47.6-69.3-88.4-102.1-118.6-129.6-146.5I/mA-151.9-206.2-246.9-302.1-352.4-390.4-437.4-470.6-523.3H/A/m-1260.77-1711.46-2049.27-2507.43-2924.92-3240.32-3630.42-3905.98-4343.39B/mT

3、-157.3-165.0-169.5-177.0-173.7-169.7-165.2-158.8-151.5I/mA-558.4-584.4-600.4-616.5-580.4-537.3-494.8-437.5-387.1H/A/m-4634.72-4850.52-4983.32-5116.95-4817.32-4459.59-4106.84-3631.25-3212.93B/mT-141.5-126.0-106.5-93.1-81.5-73.2-63.6-49.1-43.7I/mA-327.3-253.0-174.6-128.9-92.0-67.3-39.90.014.0H/A/m-271

4、6.59-2099.90-1449.18-1069.87-763.60-558.59-331.170.00116.20B/mT-27.5-5.86.726.542.257.272.192.9114.4I/mA55.8109.3140.7189.1228.1265.9303.7357.8416.6H/A/m463.14907.191167.811569.531893.232206.972520.712969.743457.78B/mT129.8138.8151.4165.1172.4I/mA461.5498.0529.2576.1601.8H/A/m3830.454133.404392.364781.634994.94六.分析讨论答:在测定磁化曲线和磁滞回线时，首先必须对铁磁材料预先进行退磁，保证外加磁场H=0时B=0。铁磁材料的磁化过程是不可逆过程。铁磁材料在外加磁场中被磁化时，外加磁场强度H与铁磁材料的磁感应强度B的大小是非线性关系。从铁磁材料的起始磁化曲线和磁滞回线可以看到，外加磁场强度H从Hm减小到零时的退磁曲线与磁场H从零开始增加到Hm时的起始磁化曲线不重合，说明退磁过程不能重复起始磁化过程的每一状态，所以铁磁材料的磁化过程是不可逆过程。七.思考题1.冲击电流计读数d之和应沿着怎样