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Cho hình vuông ABCD có cạnh dài 6cm trên đoạn BD lấy điểm E và D sao cho BE=ED=PD a) tính diện tích hình vuông ABCD b) tính diện tích hình AECP
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Câu 24. Khi nối quả cầu kim loại a tích điện dương với quả cầu kim loại b tích điện âm bằng sợi dây đồng. Dòng điện xuất hiện trong sợi dây đồng là dòng chuyển rời có hướng của loại điện tích nào? A. Electron di chuyển từ a sang b. B. Electron di chuyển từ b sang a. C. Electron di chuyển từ a sang b còn hạt nhân di chuyển từ b sang a. D. Electron di chuyển từ b sang a còn hạt nhân di chuyển từ a sang b. Câu 25. Cho 2 quả cầu A và B tích điện lại gần nhau thấy chúng đẩy nhau. Biết rằng khi đặt quả cầu A lại gần quả cầu C tích điện âm thì chúng đẩy nhau. Hỏi quả cầu A và quả cầu B tích điện loại gì? A. Đều tích điện dương. B. A tích điện âm, B tích điện dương. C. A tích điện dương, B tích điện âm. D. Đều tích điện âm.

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