用控制变量法探究电磁感应定律的实验装置设计  

DESIGN OF EXPERIMENTAL DEVICE OF ELECTROMAGNETIC INDUCTION LAW BY THE METHOD OF CONTROLLING VARIABLES

作　　者：蒋达国[1] 孙心瑗[1] 刘宇安[2] 李久明[3] 

机构地区：[1]井冈山大学数理学院,江西吉安343009 [2]井冈山大学电子与信息工程学院,江西吉安343009 [3]井冈山大学建筑工程学院,江西吉安343009

出　　处：《井冈山大学学报（自然科学版）》2015年第5期30-32,共3页Journal of Jinggangshan University (Natural Science)

基　　金：江西省教育厅教学改革项目(11064005);江西省教育厅科技计划项目(GJJ14553);江西省原子与分子物理重点学科资助项目(2011-2015)

摘　　要：设计了一种用控制变量法探究法拉第电磁感应定律的实验装置,可以定性和定量地探究感应电动势与磁通量的变化量、磁通量的变化时间和线圈匝数之间的关系。用发光二极管的亮度和电容器的电压来表征感应电动势的大小;用磁铁从线圈中水平抽出的速度和磁铁自由下落的高度来表征磁通量的变化时间;用磁铁的磁感应强度表征磁通量的变化量。An experimental device is designed for exploring Faraday＇s law of electromagnetic induction by the method of controlling variables. It can explore the relationship among induced electromotive force,variation of magnetic flux,the change time of the magnetic flux,and the number of turns of the coil,qualitatively and quantitatively. Induced electromotive force is characterized by both the brightness of light emitting diode and the voltage of capacitor. The change time of the magnetic flux is described as both the mean speed when the magnet is drawing out of the coil,and the height of the magnet which is free falling. The variation of magnetic flux is extracted from magnetic induction intensity.

关 键 词：感应电动势 磁通量的变化量 磁通量的变化时间 线圈匝数 

分 类 号：G633.7[文化科学—教育学]