Hai dây dẫn thẳng song song dài vô hạn, cách nhau a = 10 cm trong không khí, trong đó lần lượt có hai dòng điện I₁ = I₂ = 5A chạy ngược chiều nhau. Cảm ứng từ tại điểm M cách đều hai dây dẫn một đoạn bằng a = 5 cm là

Chia sẻ

Một số câu hỏi khác có thể bạn quan tâm.

• Choose the best answer for the following sentence:

  I'll come and see you before I _____________ for Ha noi.
  
  

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

  month                  together                  about                        around

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

  mark                       card                     hard                   warm

• Choose a word that has different stress pattern:

  similar                    corner                   travel                      about

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

  Chu Van An High School is one of the biggest school in Ha Noi.

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

  Lan's mother is worry about her.

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

  Try to avoid to travel during rush hours.

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

  Mr. Nam work as a teacher at Nguyen Tri Phuong School.

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

  Tom regrets selling his house.
  
  

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

  "Can you do me a favour? "