问题
问答题
有一球型电容器，内、外球壳的半径分别为a，3a，两球壳间充满两层等厚度的电介质，其相对介电常数分别为ε1和ε2。如图所示。
设在内外球壳间加上电压V，求球壳间总电场能量。
答案
参考答案：
球壳间电场能量为电容器储存的能量
。
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有一球型电容器，内、外球壳的半径分别为a，3a，两球壳间充满两层等厚度的电介质，其相对介电常数分别为ε1和ε2。如图所示。
设在内外球壳间加上电压V，求球壳间总电场能量。
参考答案：
球壳间电场能量为电容器储存的能量。
Air is all round us．It is around us___31____we walk and play．From the time we are born，air is around us on every side．When we sit down，it is around us．When we go to bed．air is 32 around us．We live 33 air． All living things 34 air．Living things cannot live 35 air．We can live without any water for 36 days，but we cannot live for more 37 a few minutes without air．When we are working 38 running，we need more air．When we are asleep，we need less air We live in air but we cannot see it．We can only feel it．We can feel it when it is 39 ． Moving air 40 wind．
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