Một ống dây hình trụ có chiều dài 1m gồm 1000 vòng mỗi vòng có đường kính 20cm a, tìm hệ số tự cảm của ống dây b, ban đầu có 1 dòng điện 1A chạy qua ống Cho dòng điện giảm dần đến 0 trong thời gian ∆t=0,1. Tìm suất điện động tự cảm trong ống dây ( Giúp e với ạ )

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1. I have never met him before → It................................................................................................................................................. 2. I have never eaten this kind of food before → It is.............................................................................................................................................. 3. I’ve never seen this film before → This.............................................................................................................................................. 4. We’ve never drunk this kind of water before → This is........................................................................................................................................... 5. He’s never been to HCM city before → It is............................................................................................................................................... 6. It is the first time I’ve seen this man → I’ve............................................................................................................................................... 7. This is the first time he phoned me. → He has............................................................................................................................................ 8. This is the first time I’ve talked to her → I’ve................................................................................................................................................ 9. This is the first time Nam has used computer → Nam has......................................................................................................................................... 10. It is the first time Tom has sung → Tom has......................................................................................................................................... 11. Ba has never listened to classical music before → This is........................................................................................................................................ 12. Nam has never seen her before → It is............................................................................................................................................. 13. I have never talked to him before → It is............................................................................................................................................. 14. It is the first time Ba has killed chickens → Ba has........................................................................................................................................... 15. It is the first time she has eaten apples → She has.........................................................................................................................................