[問題] 求解一題台中一中段考題
半徑R的導體球殼內，在距圓心R/2處放置一個點電荷Q，在球殼外距離
球殼R處放置一個點電荷q。求點電荷q所受之電力大小？
(A)kQq/4R^2(B)4kQq/9R^2(C)0
有附圖，但我不會編輯，抱歉。
好難，有人會算可以教一下嗎？
謝謝
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