直流电是否能产生磁场?

2025-03-31 21:08:02
推荐回答(5个)
回答1:

直流电能产生磁场,直流电能产生均匀变化的电场,交流电产生变化的磁场。

如果使螺线管通电,,螺线管的每一匝都会产生磁场,磁场的方向“安培定则二”:用右手握住通电螺线管,让四指指向电流的方向,那么大拇指所指的那一端是通电螺线管的N极。

那么,在相邻的两匝之间的位置,由于磁场方向相反,总的磁场相抵消;而在螺线管内部和外部,每一匝线圈产生的磁场互相叠加起来,最终形成了磁场形状。

也可以看出,在螺线管外部的磁场形状和一块磁铁产生的磁场形状是相同的。而螺线管内部的磁场刚好与外部的磁场组成闭合的磁力线。

扩展资料

电生磁的一个应用实例是实验室常用的电磁铁。为了进行某些科学实验,经常用到较强的恒定磁场,但只有普通的螺线管是不够的。

为此,除了尽可能多地绕制线圈以外,还采用两个相对的螺线管靠近放置,使得它们的N、S极相对,这样两个线包之间就产生了一个较强的磁场。另外,还在线包中间放置纯铁(称为磁轭),以聚集磁力线,增强线包中间的磁场。

如果一条通电导线处于一个磁场中,由于导线也产生磁场,那么导线产生的磁场和原有磁场就会发生相互作用,使得导线受力。这就是电动机和喇叭的基本原理。电和磁是不可分割的,它们始终交织在一起。简单地说,就是电生磁、磁生电。

参考资料来源:百度百科-电生磁

回答2:

梅忆天:恒定的直流电周围会产生稳定的磁场。是对的。物理课本又一个范例实验,一根水平导线竖直下方放置一个指南针,与导线平行方向。导线通直流电,指南针旋转变成与导线垂直方向。

判断直流电周围磁场方向,可用右手法则。右手握拳,伸出大拇指向上,大拇指方向如果代表电流方向,则其他四个手指的方向就是磁力线的方向。磁力线方向是围绕导线的。

最后说一句,恒定的电流周围会产生稳定的磁场;变化的电流周围会产生变化的磁场;稳定变化的磁场又会产生稳定的电场,以此类推。如果电场变化不稳定,就会以“电场-磁场-电场-磁场-电场……”这种形式向空间扩散开去,这就是电磁波。

回答3:

能,只要有电流,在电流周围就存在磁场

回答4:

今早刚查了书.楼主应该是对麦克斯韦电磁理论记忆混淆了.根据麦克斯韦电磁理论均匀变化的电场产生稳定的磁场,直流电就是均匀变化的电场(可看作是多个电子的定向移动)所以直流电的周围存在稳定的磁场.

回答5:

能滴 电和磁应该属于一个整体的 有电流就会有电场 有电场就会有磁场

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