球壳外表面所带电量为于是,由此解得 q'A = PA = Фв B = = QB , int QB , ext = 9 × 10 ° × ( 3 X ΦΑ = 5.6 X 103 V 1 QB , ext 4πE R3 - = ― QA QB , int QB , ext + + ...
確定! 回上一頁