[問題] 高中電場
【出處】參考書模擬試題
【題目】
http://i.imgur.com/wBl69AM.jpg
【瓶頸】
想請問各位高手,第21題的A選項
靜電長直導線的電場要怎麼判斷出來
是與距離的一次方成反比呢?
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