Mạch dao dộng điện từ LC gồm cuồn dây có $L=20mH$ và tụ điện có $C=2\mu F.$ Nếu mạch có điện trở thuần ${\mathrm{2.\; 10}}^{-2}\Omega$, để duy trì dao động trong mạch với hiệu điện thế cực đại giữa hai bản tụ điện là 10V thì phải cung cấp cho mạch một năng lượng bao nhiêu trong một chu kỳ:

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Một số câu hỏi khác có thể bạn quan tâm.

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

  account                  bound                 count              thought

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

  any               paddy                  catch                chat

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

  The schoolyard is too small to play volleyball in.
  
  

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

  Jim came down with flu and had to stay in.
   

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

  She said to us, ''Don’t be late again.''
   

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

  The rain began to fall during my walk in the country.
   

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

  I often get up early in the morning.
  
  

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

  I should have gone by bus and saved a lot of money.
   

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

  Not many people attended the meeting.
   

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

  They arrange the tests in this book according to their difficult levels.