Hỏi trắc nghiệm Câu 1: Hai diện tích q1, q; khi đặt gần nhau thì chúng hút nhau. Kết luận nào sau đây luôn đúng? A. Q1, q2 đều là diện tích dương B. Q1, q2 đều là điện tích âm C. Q1, q2 trái cùng dấu nhau D. Q1, q2 trái dấu nhau Câu 2: Khi khoảng cách giữa hai điện tích điểm trong chân không giảm xuống 2 lần thị độ lớn lực Cu - Lông A.Tăng 4 lần B. Tăng 2 lần C. Giảm 4 lần D.Giam 4 lần Câu 3: Lực tương tác giữa các điện tích khi đặt trong một điện môi sẽ lớn hay nhỏ hơn khi đặt trong chân không? Bài 1. Cho q = q2 = - 3.10°C , đặt cách nhau 10cm trong không khí. Tính độ lớn của lực tương tác giữa hai điện tích đó. F21 F12 a | 9 ,
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Ответ:
third one with arrows on top of each other going the same direction