Một ống dây dài 20 cm, có 1200 vòng dây đặt trong không khí. Cảm ứng từ bên trong ống dây là 75. 10^-3 T. Cường độ dòng điện chạy trong ống dây là

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Một số câu hỏi khác có thể bạn quan tâm.

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

  According to a new study, every 3 months the rate of Internet use increases by 25%, that is substantial.

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

  More and more people are becoming addicted to the Internet and finding it difficult for them

  to stop using it.

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

  Mobile phones have had a significantly impact on telephone networks.

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

  Mobile phone subscriptions now outnumber fixed-line one in many markets.

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

  The sale of mobile phones in 2005 was totally about 816.6 million subscribers with that

  figure being almost equally sharing among the markets.

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

  Nearly 2,000 people climbing Mount Everest and at least 202 have died when trying to

  summit the mount, and the corpses have been left on the mountain.

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

  Brent Bishop is the leader of the Sagarmatha Environmental Expedition (SEE), a nonprofit

  organization which established to clean Everest.

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

  The US’s oil consumption is approximately 21 million barrels a day, howeve production

  that is only 6 million barrels a day.

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

  Over two decades Vietnam has emerged as an important regional produce of oil and natural

  gas in Southeast Asia.
  
  
  

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

  Half of Vietnam’s domestic energy consumption come from oil, with hydropower 20%, coal

  18%, and natural gas 12%.