Cho một ống dây thẳng dài 25 cm, tiết diện 4 cm2, có 300 vòng, và đặt trong chân không. Hãy tính suất điện động tự cảm trong ống dây khi có dòng điện chạy trong ống dây và cường độ của nó giảm với tốc độ 50 A/s.

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Giúp mik Mark the letter A, B, C or D on your answer sheet to indicate the sentence that best combine the pair of sentences given in each of the following questions. Question 36. The girl is very lovely. She lives next door to us. A. The girl lives next door to us is very lovely. B. The girl whose lives next door to us is very lovely. C. The girl which lives next door to us is very lovely. D. The girl who lives next door to us is very lovely. Question 37. The man wanted to get some fresh air in the room. He opened the window. A. Having opened the window, the room could get some fresh air. B. The man wanted to get some fresh air in the room because he opened the window. C. The man opened the window in order that he could get some fresh air in the room. D. The man got some fresh air in the room, even though he opened the window. Question 38. We cut down many forests. The Earth becomes hot. A.The more we cut down forests, the Earth becomes hotter. B. The more forests we cut down, the Earth becomes the hotter. C. The more forests we cut down the hotter the Earth becomes. D. The more forests we cut down, the more hotter the Earth becomes. Mark the letter A, B, C or D on your answer sheet to indicate the best sentence that can be made from the cues given. Question 39. Father's Day celebrate third Sunday / June / some countries. A. Father's Day is celebrating on the third Sunday in Junc in some countries. B. Father's Day is celebrated in the third Sunday in June in some countries. C. Father's Day is celebrating in the third Sunday in Junc in some countries. D. Father's Day is celebrated on the third Sunday in June in some countries Question 40. Would mind/ I / ask/question /your/ eating habits? A. Would you mind if I will ask you a question about eating habits? B. Would you mind if I ask you a question about eating habits? C. Would you mind if I asked you a question about your cating habits? D. Would you mind if I asking you a question about cating habits?