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6 - 7 两个带有等量异号电荷的无限长同轴圆柱面 , 半径分别为 R 1 和 R 2 > R 1 ) , 单位长度上的电荷为 λ. 求离轴线为 r 处的电场强度 :( 1 ) r < R 1 ,( 2 ) R 1 < r < R 2 ,( 3 ) r > R 2 . 6 - 8 两个同心球面的半径分别为 R 1 和 R 2 , 各自带有电荷 Q 1 和 Q 2 . 求 :( 1 ) 各区域电势分布 , 并画出分布曲线 ;( 2 ) 两球面间的电势差为多少 ? 6 -12 一导体球半径为 R 1 , 外罩一半径为 R 2 的同心薄导体球壳 , 外球壳所带总电荷为 Q , 而内球的电势为 V 0 . 求此系统的电势和电场的分布 . 6 - 14 半径为 0 . 10 cm 的长直导线 , 外面套有内半径为 1 . 0 cm 的共轴导体圆筒 , 导线与圆筒间为空气 . 略去边缘效应 , 求 :(1) 导线 表面最大电荷面密度;( 2 ) 沿轴线单位长度的最大电场能量.
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