What this tells you is E In particular,if you have an empty region of space or a region 0 where nothing has electrical charge then E has divergence equal to zero.
这个告诉你们的是,的散度由电荷的存在引起的，that，divergence，of，E，is，caused，by，the，presence，of，electric，charge。,一个真空区域，或没有电荷的区域,那么E的散度等于。
A proton has an electrical charge that is equal to that of the electron, but the proton weighs almost two thousand times as much as the electron.
质子有一个电荷，与电子的电荷相等，但是，质子的重量几乎是电子的两千倍。
When a suBstance has no net electrical charge, the total numBers of positive and negative charges within it must just Be equal.
当物质没有净电荷时，它内部的正负电荷总数必定正好相等。
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