地磁水平分量的测量  

Measurements of the horizontal component of geomagnetic field

作　　者：胡小鹏[1] 周进[1] 

机构地区：[1]南京大学物理学院,江苏南京210093

出　　处：《物理实验》2017年第4期27-29,38,共4页Physics Experimentation

摘　　要：用动力学的方法测量了地磁场的水平分量.通过改变电路中电流的大小和方向,测量磁针在地磁场水平分量和外加亥姆霍兹线圈产生的合磁场的共同作用下的简谐振动周期,用作图法得到合磁场为零的电流值,从而得到地磁场水平分量.The horizontal component of geomagnetic field was measured using a dynamical method. By changing the value and direction of the current in a circuit, the harmonic vibration periods of a magnetic needle were measured in a hybrid magnetic field, consisting the horizontal component of geomagnetic field and an additional one from a Helmholtz loop. By plotting the data, the critical current was obtained when the net magnetic field on the needle was zero. Then the horizontal component of geomagnetic field was determined.

关 键 词：地磁场 亥姆霍兹线圈 补偿法 振动 

分 类 号：O441[理学—电磁学]