摘要
电磁场教材中把电容公式C=q/U的适用条件表述为"适用于两个导体很近或无外导体时",现通过对两道例题的讨论,指出教材中的说法具有片面性,不利于正确掌握电容的计算。进一步运用多导体系的部分电容理论进行分析,得出了适用条件应改为"外界对电容器的电势差无影响"的结论,为电容器的教学提供了参考意见。
In the textbook of electromagnetic field, the applicable condition of the capacitance formula C=q/U is expressed as＂suitable for the two conductor is very close to or without outer conductor＂. Through the discussion of two examples, it is pointed out that the statement in the teaching material is one-sided, is not conducive to the correct grasp of the calculation of capacitance. Further use of Partial capacitance theory of multi-conductor system analysis, demonstrated the applicable conditions should be modified for： ＂The outside world has no effect on the potential difference of capacitor＂. This expression provides a reference for the teaching of capacitor.
作者
邓炯
杨昌亿
DENG Jiong YANG Chang-yi(Xingjian College of Science and Liberal Arts, Guangxi University, Nanning 530005, Chin)
出处
《价值工程》
2016年第28期200-201,共2页
Value Engineering
基金
广西大学行健文理学院科研基金(No:2013JGLX07)资助
关键词
电容
电容器
电势
电势差
capacitance
capacitor
potential
potential difference
