Đặt điện áp xoay chiều có giá trị cực đại là 100 V vào hai đầu một đoạn mạch chỉ chứa tụ điện thì cường độ dòng điện chạy qua đoạn mạch có biểu thức i = 2 cos (100πt) A. Tại thời điểm điện áp có giá trị 50 V và đang tăng thì cường độ dòng điện là:

Chia sẻ

Một số câu hỏi khác có thể bạn quan tâm.

• Find a mistake in the four underlined parts of the sentence and correct it:

  Thanksgiving is a truly American holiday. Nobody should has dinner alone on that day.

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

  cough             though              thought                 eighty

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

  cutlery                 party                  carry                  reply

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

  he / not / go / class / this / morning / nobody / know / why /
  
  

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

  vase / break / it / no one / fault / .
  
  

• Choose the best answer for the following sentence:

  We refrained __________ talking until we knew that it was safe.

   

• Choose the best answer for the following sentence:

  There is a ______________ for unemployment to rise in the summer.

   

• Choose the best answer for the following sentence:

  Young guests often have willing ________________ in any kinds of entertainment.

    

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

  everyone / like / her / because / she / kind / caring / teacher /.
  
  

•  Choose the best answer for the following sentence:

  It’s interesting at parties to see how people ____________  socially.