星期二要交的EM作業中有一題:

 

我早上算了老半天,就快證明成功了,但是就是差那麼一些係數湊不起來,

想破頭了,不知道是不是typo,

就寫信去給教授!!

 

Dear Professor Jorge, (他是很好很好的教授!!)

I want to confirm that in problem 8,

未命名 - 1.jpg

I am not sure whether I have mistakes in my calculation or there is a typo.



未命名 - 2.jpg
that will match the potential produced by the image charge.
未命名 - 3.jpg



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今天下午收到回信:

 

I don't think that there is any typo.

However, your figure seems to show the image charge located at "d"
when it is actually located at d'=a*a/d. Hope this helps.

 

幹!瞬間我懂了,原來是我把 d' 寫成d了

這就是頓悟阿

就這樣花了快四小時一直思考與檢查。。。。。。

 

 

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