Đặt điện áp xoay chiều có giá trị hiệu dụng không đổi, tần số 50Hz vào hai đầu đoạn mạch mắc nối tiếp gồm điện trở thuần, cuộn cảm thuần và tụ điện có điện dung thay đổi được. Điều chỉnh điện dung C đến giá trị bằng  hoặc  thì điện áp điện dụng hai đầu cuộn cảm thuần đều có giá trị bằng nhau. Giá trị của độ tự cảm L bằng bao nhiêu ?         

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Một số câu hỏi khác có thể bạn quan tâm.

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  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:

  Communication is the act of transferring information through neither verbal messages or non-verbal signals.         

• 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:

  The shocking news in newspapers are what people are talking about this morning.         

• 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 the recommendation of many psychologists that a learner ought to use mental images to associate word and remember them.         

• 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:

  You shouldn’t criticize him in front of his friends. It was insensitive of you.         

• 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:

  Although no H7N9 avian flu infections have reported in poultry or humans yet, the likelihood of outbreaks in Viet Nam is high.          

• Mark the letter A, B, C or D to indicate the underlined part that needs correction in each of the following questions:

  It was my father whom talked me into learning another foreign language.  

• Mark the letter A, B, C or D to indicate the underlined part that needs correction in each of the following questions:

  How seems to be the greatest injustice of all, however, is that the new lands that Columbus discovered were never given his name.         

• Mark the letter A, B, C or D to indicate the underlined part that needs correction in each of the following questions:

  In the 1960s, urban renewal projects cleared land for commerce and offices buildings.         

• 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:

  You should stop wasting your time and doing something useful instead.         

• 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:

  Her passion for helping people have motivated her to found her own charity organization.