tại sao khi cho nam châm quay trước cuộn dây dẫn kín thì trong cuộn dây lại xuất hiện dogf điện xoay chiều

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I.Tìm lỗi sai và sửa lại: 1. When he still worked for Oxfam, he was coming up with different ideas to help needy people. 2. The volunteers went to a nearby school on a Sunday morning, picked up a food package, and delivered them to an elderly person. II. 1. You should have taken those books back to the library. =>Those books ………………………………………………………………………… 2. We cannot exchange articles → Articles................................................................................................................. 3. You mustn't move c; he's too ill. → This man................................................................................................................. 4. When they have widened this street, the roar of the traffic will keep residents awake all night. → When they have widened this street,................................................................................ 5.They ought to have reported the accident to the police. → The accident................................................................................................................. 6. You must dry-clean it. → It................................................................................................................. 7. We often talk during our break time. (spending) → While we …………………………………………………………………… 8. He often bothers us during our learning lessons. (learning) → While we ………………………………………………………………………… 9. They usually make noise during my taking days off. (taking) → While I ………………………………………………………………………… 10. She frequently dozes during her working. (working) → While she ………………………………………………………………………