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庫侖者,所以言電荷之大小也。其符曰C。出於安培。(安培者,所以言電流之大小)。於一安培之電流,一秒之內過橫截面之電荷之數,即一庫侖也。
二〇一九年,萬國公制更,以電子之荷為一點六零二一七六六三四乘十之負十九次方(1.602 176 634×10-19)庫侖,故一庫侖為約六百二十四京(6.24×1018)電子所荷也。
靜電學之法也。其式曰:
k為庫侖常數,q為電荷量,r為電荷相去之遠近也。電荷相引及相斥,皆緣庫侖定律。
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