1000万粉丝科普播主Veritasium翻车?30万公里长的导线,灯泡几秒才会亮?

彭导分享 November 28, 2021
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一个典型的科学爱好者~ 个人博客:pdsharing.com

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【加入会员链接】https://www.youtube.com/channel/UCSs4A6HYKmHA2MG_0z-F0xw/join 【订阅频道链接】https://www.youtube.com/李永乐老师 ------------------------------------------------ 视频内容: 拥有一千万粉丝的著名科普频道Veritasium几天前发布了一条视频:如果用两根三十万公里长的导线组成电路,开关闭合后多久灯泡才会亮?他给出的答案是三亿分之一秒。视频发出后,许多网友说他翻车了。要解决这个问题,我们必须首先了解:电能其实并不是通过电流传播的,而是通过电磁场传播的。在电路接通时,电路中形成电流,电流形成磁场,电场和磁场一起让能量从电池释放到空间中,再传递到灯泡上。因为电磁波的传播速度是光速,所以我们说电流的速度也是光速。尽管电能是在空间中依靠电磁场传播,导线的作用也必不可少,导线促进了电流的产生,也引导空间中的电磁场。了解这些知识后,对Veritasium提出的问题,也许会有更加合理的解答。 ------------------------------------------------ 内容章节: 00:00 Veritasium提出的问题 00:49 什么是电流 06:05 电磁场与电磁波 09:29 坡印廷矢量 13:05 电路中的电磁场 21:30 电路中的能量传递 22:30 Veritasium的题目与选项 24:13 Veritasium答案的三个问题 28:45 真正的答案 29:38 内容结尾 ------------------------------------------------ Veritasium的原视频链接: https://www.youtube.com/watch?v=bHIhgxav9LY ------------------------------------------------ 火热视频推荐: 如何才能摆脱贫穷?穷人和富人有什么差别? https://youtu.be/aBTDvlteZcs 120万一针的抗癌神药为啥这么贵? https://youtu.be/Y2nFl0OY2bs 中国科学家用CO₂人工合成淀粉!原理是什么? https://youtu.be/0i8tqtudhZQ 如何推翻相对论?广义相对论的建立和实验验证 https://youtu.be/floPQomkJas 为什么1+1=2?生三胎需要什么条件? https://youtu.be/zXFl3ojjmJM 李永乐和马斯克财富差距有多大? https://youtu.be/y5coTWUm39M 【经济泡沫1/4】一朵花换一栋楼? https://youtu.be/PXseMoyGKzY 追剧买VIP会员去广告,值不值? https://youtu.be/I31v-HQ9oGo 神奇的鲁伯特之泪:子弹打不碎,一捏就爆炸 https://youtu.be/En2GKUD1ty0 千万不要用微波炉烧水!李永乐老师讲过热/过冷液体 https://youtu.be/VLW2vUgopt0 5G到底是什么?它能成为创造未来的新科技吗? https://youtu.be/VdSFah46d7Y 如何才能长生不老?生命的时钟在哪里? https://youtu.be/n1aUMs6OlGM 新中国最严重溃坝事故:河南“75.8”特大水灾是如何发生的? https://youtu.be/A-SUR7UyZJ0 千万不要用微波炉烧水! https://youtu.be/VLW2vUgopt0 美团、阿里被罚!互联网垄断巨头是如何诞生的? https://youtu.be/lhgs5CUocgg ------------------------------------------------ 大家有什么想看的内容,可以在下方留言!

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