Một máy biến áp cuộn sơ cấp có 500 vòng dây, cuộn thứ cấp có 50 vòng dây. Điện áp hiệu dụng ở hai đầu cuộn sơ cấp là 100V. Biết chỉ 70% đường sức từ do cuộn sơ cấp ( tạo ra ) đi vào cuộn thứ cấp. Điện áp ở cuộn thứ cấp là ?  

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Một số câu hỏi khác có thể bạn quan tâm.

• Choose the best answer for the following sentence:

  His chicken soup is better than any other soups I ____________ .
  
  

• Choose the best answer for the following sentence:

  So far as Mrs. Brown was concerned she did not seem to be in the least __________.
   

• Choose the best answer for the following sentence:

  She solved the problem ______________ .
  
  

• Choose the best answer for the following sentence:

  He did not come and she looked rather ____________.
   

• Choose the best answer for the following sentence:

  Liz moved _____________ .
  
  

• Choose the best answer for the following sentence:

  Jane put the chair ______________ the corner of the room.
  
  

• Choose the best answer for the following sentence:

  The man ____________ son goes to school with us is very old.
  
  

• Choose the best answer for the following sentence:

  I have never seen them since _____________ .
  
  

• Choose the best answer for the following sentence:

  She is not ____________ with her position.
   

• Choose the best answer for the following sentence:

  ___________ the eldest sister in the family, she tries to help her parents in the kitchen.