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nguyenthithaolqd2011
2 năm trước
Một con lắc đơn có chiều dài dây treo $25$ $cm$, vật nặng là hòn bi có khối lượng $10$ $g$ và mang điện tích $q$ $=$ $10^{-4}C$. Treo con lắc vào giữa hai bản kim loại thẳng đứng, song song, cách nhau $d=20cm$. Đặt vào hai bản hiệu điện thế một chiều $U=100V$. Lấy $g=10m/s^{2}$. Gia tốc trọng trường hiệu dụng của con lắc bằng A. $11,2m/s^{2}$ B. $14,3m/s^{2}$ C. $16,4m/s^{2}$ D. $17,5m/s^{2}$
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