真空中两等量异种点电荷带电量均为q,相距为r.两点电荷连线中点的电场强度为?A.0 B.2kq/(r^2)C.4kq/(r^2)D.8kq/(r^2)k是什么?如果是两等量同种电荷的话,还要用场强叠加法吗?为什么?
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![真空中两等量异种点电荷带电量均为q,相距为r.两点电荷连线中点的电场强度为?A.0 B.2kq/(r^2)C.4kq/(r^2)D.8kq/(r^2)k是什么?如果是两等量同种电荷的话,还要用场强叠加法吗?为什么?](/uploads/image/z/1480934-38-4.jpg?t=%E7%9C%9F%E7%A9%BA%E4%B8%AD%E4%B8%A4%E7%AD%89%E9%87%8F%E5%BC%82%E7%A7%8D%E7%82%B9%E7%94%B5%E8%8D%B7%E5%B8%A6%E7%94%B5%E9%87%8F%E5%9D%87%E4%B8%BAq%2C%E7%9B%B8%E8%B7%9D%E4%B8%BAr.%E4%B8%A4%E7%82%B9%E7%94%B5%E8%8D%B7%E8%BF%9E%E7%BA%BF%E4%B8%AD%E7%82%B9%E7%9A%84%E7%94%B5%E5%9C%BA%E5%BC%BA%E5%BA%A6%E4%B8%BA%3FA.0+B.2kq%2F%28r%5E2%29C.4kq%2F%28r%5E2%29D.8kq%2F%28r%5E2%29k%E6%98%AF%E4%BB%80%E4%B9%88%3F%E5%A6%82%E6%9E%9C%E6%98%AF%E4%B8%A4%E7%AD%89%E9%87%8F%E5%90%8C%E7%A7%8D%E7%94%B5%E8%8D%B7%E7%9A%84%E8%AF%9D%2C%E8%BF%98%E8%A6%81%E7%94%A8%E5%9C%BA%E5%BC%BA%E5%8F%A0%E5%8A%A0%E6%B3%95%E5%90%97%3F%E4%B8%BA%E4%BB%80%E4%B9%88%3F)
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