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Physics, 14.06.2021 15:40 paulagarza
đặt lần lượt các điện tích q1=1nC, q2=-1nC, q3=1nC, q4=1nC vào các đỉnh A, B, C ,D của hình chữ nhật, kích thước 20cm x 40cm trong không khí. Tính điện thế tại O là giao điểm của 2 đường chéo hình chữ nhật, chọn góc điện thế tại vô cùng.
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đặt lần lượt các điện tích q1=1nC, q2=-1nC, q3=1nC, q4=1nC vào các đỉnh A, B, C ,D của hình chữ nhật...
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