[領域] 電學

[來源] 老師考題

[題目] A charge +q is at the origin. A charge -2q is at x=2.00m on the x axis.
       For what finite values of x is
       (a) the electric field zero?  (b) the electric potential zero?

[瓶頸] 說來好笑  囧  其實我是看不懂他題目想問什麼@@  雖然單字都看得懂~"~


可否幫我解釋一下他的意思Orz  還有要怎麼算@@a  感謝

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