等边三角形ABC顶点A处放上正点电荷Q时,在C处的场强为E,在B处再放一个同样的正点电荷Q后,C处的场强为多大?
等边三角形ABC顶点A处放上正点电荷Q时,在C处的场强为E,在B处再放一个同样的正点电荷Q后,C处的场强为多大?
数学人气:428 ℃时间:2020-03-06 15:13:39
优质解答
用余弦定理加力的平行四边行法则得到根号3
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