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• Dòng điện cảm ứng trong cuộn dây dẫn kín đổi chiều khi số đường sức từ xuyên qua tiết diện S của cuộn dây

Câu 1:

Dòng điện cảm ứng trong cuộn dây dẫn kín đổi chiều khi số đường sức từ xuyên qua tiết diện S của cuộn dây

A.

tăng dần theo thời gian.

B.

giảm dần theo thời gian.

C.

tăng hoặc giảm đều đặn theo thời gian.

D.

đang tăng mà chuyển sang giảm hoặc ngược lại.

Feedback Dòng điện cảm ứng trong cuộn dây dẫn kín đổi chiều khi số đường sức từ xuyên qua tiết diện S của cuộn dây đang tăng mà chuyển sang giảm hoặc ngược lại.

Những câu hỏi này đến từ bài kiểm tra này. Bạn có muốn thực hiện bài kiểm tra thử không?

Trắc nghiệm Vật Lý lớp 9 - Điện từ học - Đề số 2

• 20 phút
• 10 câu hỏi

Làm bài kiểm tra

Một số câu hỏi từ cùng một bài kiểm tra

• Ta phân biệt cuộn sơ cấp và thứ cấp của máy biến thế là dựa vào

• Máy biến thế dùng để

• Dòng điện xoay chiều khác dòng điện một chiều ở điểm

• Lõi kim loại trong nam châm điện thường làm bằng chất gì để từ tính của nó mạnh nhất?

• Chiều của lực điện từ tác dụng lên dây dẫn có dòng điện chạy qua phụ thuộc vào

• Trong cấu tạo của động cơ điện một chiều không có bộ phận nào?

• Dòng điện cảm ứng trong cuộn dây dẫn kín đổi chiều khi số đường sức từ xuyên qua tiết diện S của cuộn dây

• Ta phân biệt cuộn sơ cấp và thứ cấp của máy biến thế là dựa vào

• Nguyên tắc hoạt động của máy biến thế là

• Dòng điện cảm ứng xoay chiều xuất hiện trong cuộn dây dẫn kín khi số đường sức từ xuyên qua tiết diện S của cuộn dây

Một số câu hỏi khác bạn có thể quan tâm

• Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 28 to 34.

            Southern Thailand was hit Thursday by the most severe haze from forest fires in Indonesia, forcing all schools in a province to close and disrupting flights in a popular tourist area, officially said.

            The haze that has shrouded parts of Malaysia and Singapore for nearly two months reached hazardous levels in the southern Thai city of Songkhla, with the pollution index hitting a record-high reading of 365. A reading of 101-200 is unhealthy, 201-300 is very unhealthy and above 300 is hazardous.

            “This is a crisis,” said Halem Jemarican, head of the Southern Environment Office. He said the pollution index in southern Thailand has never exceeded 300 before. Halem said his office has worked with other authorities to have all schools in Songkhla province send students home and all outdoor sports stadiums to close temporarily. Warnings have been issued to vulnerable people such as children, the elderly and people with illnesses not to go out of their homes.

            “The wind speed is very low this year in the south, causing haze to stay in our skies longer,” Halem said by telephone.

            An airport official in Hat Yai, a popular tourist area, said three flights bound for Bangkok were delayed Thursday morning because of the haze. A flight from Bangkok to Hat Yai was diverted to Surat Thani on Wednesday evening. The official declined to be identified because of working rules.

            Local media reported that cloud seeding has been discussed as a way to dispel the haze in southern Thailand, which is hundreds of kilometers (miles) from the forest fires in Indonesia’s Sumatra island.

            Southern Thailand boasts tropical beaches popular among tourists in Surat Thani and Phuket, two of the seven provinces suffering from the haze.

  The following actions are taken by die authorities in response to the haze EXCEPT _____________.

• Số  Bảy trăm năm mươi tám nghìn hai trăm hai mươi viết là

• Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.

  It is (A) interested (B) to compare the early stylized art forms (C) of ancient civilizations (D) with the modem abstract forms of art.

• Read the following pasage and mark the letter A. B, C or D on your answer sheet to indicate the correct answer to each of the questions from 41 to 48.

  Another critical factor that plays a part in susceptibility to colds is age. A study done by the University of Michigan School of Public Health revealed particulars that seem to hold true for the general population. Infants are the most cold-ridden group, averaging more than six colds in their first year. Boys have more colds than girls up to age three. After the age of three, girls are more susceptible than boy's , and teenege girls average three colds a year to boy’s two.

  The general incidence of continues to decline into maturity. Elderly people who are in good health have as few as one or two colds annually. One exception is founds among people in the twentics, especially women, who show a rise in cold infections, because people in this age group are most likely to have young children. Adults who delay having children until thirties forties experience the same sudden increase in cold infections.

  The study also found that economics play an important role. As income increases, the frequency at which are reported in the family decreases. Families with the lowest income suffer about a third more colds than families at the lower end. Lower income generally forces people to live in more cramped quarters than those typically occupied by wealthier by wealthier people, and crowding increses the opportunities for the cold virus totravel from person to person. Low income may also adversely influence diet. The degree to which poor nutrition affects susceptibility to colds is not yet clearly established, but an inadequate diet is suspected of lowering resistance generally.

  (source: TOEFL reading)

  It maybe inferred from the passage that which of the following groups of people is most likely to catch colds?

• Khi lên men m kg ngô chứa 65% tinh bột với hiệu suất toàn quá trình là 80% thì thu được 5 lít rượu etylic 200 và V m3 khí CO2 (đktc). Cho khối lượng riêng của C2H5OH nguyên chất là 0,8 g/ml. Giá trị của m và V lần lượt là:

• Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions

  Fish that live on the sea bottom benefit by being flat and hugging the contours. There are two very different types of flatfish and they have evolved in very separate ways. The skates and rays, relatives of the sharks have become flat in what might be called the obvious way. Their bodies have grown out sideways to form great “wings” They look as though they have been flattened but have remained symmetrical and “the right way up”. Conversely fish such as plaice, sole, and halibut have become flat in a different way. There are bony fish which have a marked tendency to be flattened in a vertical direction; they are much “taller” than they are wide. They use their whole vertically flattened bodies as swimming surfaces, which undulate through the water as they move. Therefore when their ancestors migrated to the seabed, they lay on one side than on their bellies. However, this raises the problem that one eye was always looking down into the sand and was effectively useless - In evolution this problem was solved by the lower eye “moving” around the other side. We see this process of moving around enacted in the development of every young bony flatfish. It starts life swimming near the surface, and is symmetrical and vertically flattened, but then the skull starts to grow in a strange asymmetrical twisted fashion, so that one eye for instance the left, moves over the top of the head upwards, an old Picasso - like vision. Incidentally, some species of 20 flatfish settle on the right side, others on the left, and others on either side.

  The word “conversely” is closest in meaning to: