Although the evidence is weak, there has been concern in recent years over possible health effects from the magnetic fields generated by electric transmission lines. A typical high-voltage transmission line is 20 m above the ground and carries a 200 A current at a potential of 110 kVA. Estimate the magnetic field strength on the ground underneath such a line.B. What percentage of the earth’s magnetic field does this represent?
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Ответ:
Even if you hit puberty late, you're unlikely to grow significantly after the ages of 18 to 20 . Most boys reach their peak height around the age of 16. However, men still develop in other ways well into their twenties.
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