内表面带+Q,外表面电量=0
球壳内外表之间作一高斯面S,因导体内E处处为0,故过S电通量为0,S所围空间内电荷代数和=0,而球壳内有一点电荷-Q,故球壳内表面带电量=+Q.而金属球壳总带电为+Q,故外表面带电量为0 .可以认为金属球壳带的+Q,被球壳内的-Q吸引到内表面,外表面不带电.
An Easy Physics Question For College
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