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ttrraannggbbhh1992
2 năm trước
Cho hai giọt nước giống nhau, mỗi giọt có thừa 1 electron. Cho rằng các giọt nước hình cầu và biết rằng lực đẩy tĩnh điện tác dụng lên mỗi giọt nước cân bằng với lực hấp dẫn của chúng. Tính bán kính R của mỗi giọt nước.
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