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I=Q/t是電流的定義式,式中未涉及面積,當然可以認為I與面積無關.這個定義可更準確的理解為:單位時間內通過某一截面的電量.截面無論多大多小,只要單位時間通過的電量相等,就認為電流相等.I=neSv可由定義導出:設導線...
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