Đặt điện áp u = U₀cos(wt + φ) (U_{0 v}à j không đổi) vào hai đầu đoạn mạch mắc nối tiếp gồm điện trở thuần, tụ điện và cuộn cảm thuần có độ tự cảm L thay đổi được. Khi L = L₁ hoặc L = L₂ thì cường độ dòng điện hiệu dụng trong đoạn mặt bằng nhau. Để cường độ dòng điện hiệu dụng trong đoạn mạch đạt giá trị cực đại thì giá trị của L bằng:  

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Một số câu hỏi khác có thể bạn quan tâm.

• Choose the correct sentence which is built from the words and phrases given:

  energy / electricity / can / of / heat / other / be / and / solar / forms / into / as / energy / converted / such
  
  

• Choose one sentence that has the same meaning as the root one:

  Jane made a cake but nobody liked it.
  
  

• Choose one sentence that has the same meaning as the root one:

  I do not like watching TV as TV discourages conversations and prevents creativity.
  
  

• Choose one sentence that has the same meaning as the root one:

  She paints watercolor pictures of flowers as a hobby.
  
  

• Choose one sentence that has the same meaning as the root one:

  I always dream of appearing on stage.
  
  

• Choose one sentence that has the same meaning as the root one:

  They have planted thousands of trees along the new boulevard.
  
  

• Choose the best answer for the following sentence:

  ____________ do many people do volunteer work?
   

• Choose the best answer for the following sentence:

  Do you _____________ volunteer work?
   

• Choose one sentence that has the same meaning as the root one:

  Peter cannot speak English, and I cannot either.
  
  

• Choose the best answer for the following sentence:

  _____________ the museum, we decided to have lunch in the park.