Một electron bay vào một từ trường đều có cảm ứng từ B với vận tốc v. Khi góc hợp bởi v và B bằng θ, quỹ đạo chuyển động của electron có dạng

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Một số câu hỏi khác có thể bạn quan tâm.

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

  We always stand by you when you are in need.
  
  

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

  The sign says, “Keep off the grass.”
  
  

• Choose a word that has different stress pattern:

  powerful              medical               dangerous                 computer

• Choose a word that has different stress pattern:

  influence              confident                disappear                  terrorism

• Choose a word that has different stress pattern:

  corporation                electronic              responsibility              electricity

• Choose a word that has different stress pattern:

  ahead              system                paper               shuttle

• Choose a word that has different stress pattern:

  history             depression                invention                completely

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

  Just imagine / human life / be like / 20 years.
  
  

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

  I hope / we / able / solve the problems / over population and pollution.
  
  

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

  Cancers and AIDS / untreatable / now / be cured successfully.