[問題] 有關Image charge
一半徑為R之球形導體 導體外部距球心a處有一電荷q
導體表面電位為0
在導體內部距球心b處會產生一電量為q'=(-R/a)q之image charge
& b=(R^2)/a
我不懂是q'以及b的值是怎麼求得的
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