Cho một khung dây có diện tích S đặt trong từ trường đều, cảm ứng từ , là góc hợp bởi và pháp tuyến của mặt phẳng khung dây. Công thức tính từ thông gửi qua S là: 

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Một số câu hỏi khác có thể bạn quan tâm.

• Choose the best answer for the following sentence:

  It _____________ possible for me to continue playing tennis since I ____________ school.

   

• Choose the best answer for the following sentence:

  ______________ months have been very trying.
   

• Choose the best answer for the following sentence:

  One of our difficulties is we do not always have the ____________ addresses of all our members.
   

• Choose the best answer for the following sentence:

  _____________ that's happened is a waste of time.
   

• Choose the best answer for the following sentence:

  I don't think ______________ knows ____________ about it.
  

• Choose the best answer for the following sentence:

  Most of people would like, ___________ to read faster.
   

• Choose the best answer for the following sentence:

  I admired him ____________ his acting beautifully.
  
  

• Choose the best answer for the following sentence:

  President Kennedy __________ when he __________ through Dallas.
   

• Choose the best answer for the following sentence:

  Some of the proposals ___________ .
   

• Choose the word that has the underlined part pronounced differently from the rest:

  appropriate                                 approach                                     attitude                            attraction