图 10-15 中 A 、 B 、 C 三点都在电场中,已知 AC ⊥ BC ,∠ ABC = 60 °, BC = 20cm .把一个电量 q = 10 -5 C 的正电荷从 A 移到 B ,电场力做功为零;从 B 移到 C ,电场力做功为 -1.73 × 10 -3 J ,则该电场的场强大小和方向是 [ ]
【简答题】Nowadays many people go abroad. Then they must learn some customs about the country because different countries have different customs. In order that we can learn more about customs, the Culture Palac...