Bài 1: Cho 2 điện tích q1=10^-8(C); q2= 9×10^8 (C) đặt tại 2 điểm A,B cách nhau 15cm trong không khí. Tìm: a) Cường độ điện trường do q2 tác dụng điểm M cách nó 10cm b) Giả sử M nằm trong đoạn A,B. Tính cường độ điện trường tổng hợp tại M c) Tìm điểm C có cường độ điện trường triệt tiêu

Các câu hỏi liên quan

Giúp e vs ak Viết lại câu sao cho nghĩa không đổi: 1. The last time we saw her was on Christmas day. We haven’t ................................................................................................. 2. I haven’t eaten this kind of food before. This is .......................................................................................................... 3. It started raining an hour ago. It has ............................................................................................................ 4. We haven’t visited my grandfather for two months. The last time ............................................................................................... 5. I have studied English for three years. I began ......................................................................................................... 6. My brother hasn’t seen his best friend for nearly five years. It’s ............................................................................................................... 7. When did you start learning English? How long ..................................................................................................... 8. We started living here fifteen years ago. We have....................................................................................................... 9. The last time she visited me was five years ago. She hasn’t.................................................................................................... 10. I last wrote to my uncle in July. I haven’t ..................................................................................................... 11. It’s long time since we became close friend. We have....................................................................................................... 12. Minh began to collect stamps in 2000. Minh has......................................................................................................