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Консультация № 179239
26.06.2010, 22:46
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Горизонтальные рельсы находятся на расстоянии l = 0,3 м друг от друга. На них лежит стержень, перпендикулярный рельсам. Какой должна быть индукция магнитного поля для того, чтобы стержень начал двигаться,если по нему пропускается ток силой I0 = 50 А? Коэффициент трения стержня о рельсы k = 0,2. Масса стержня 0,5 кг.
Обсуждение
27.06.2010, 09:00
общий
это ответ
Здравствуйте, noobjkee.
В горизонтальной плоскости на стержень действуют сила Ампера FA = I0Bl и сила трения покоя Fтр = kmg, направленные противоположно друг другу. Движение проводника станет возможным, когда сила Ампера превысит силу трения покоя, т. е. когда станет выполняться неравенство
I0Bl > kmg, откуда находим B > kmg/(I0l) = 0,2 ∙ 0,5 ∙ 9,81/(50 ∙ 0,3) ≈ 6,5 ∙ 10-2 (Тл).
С уважением.
В горизонтальной плоскости на стержень действуют сила Ампера FA = I0Bl и сила трения покоя Fтр = kmg, направленные противоположно друг другу. Движение проводника станет возможным, когда сила Ампера превысит силу трения покоя, т. е. когда станет выполняться неравенство
I0Bl > kmg, откуда находим B > kmg/(I0l) = 0,2 ∙ 0,5 ∙ 9,81/(50 ∙ 0,3) ≈ 6,5 ∙ 10-2 (Тл).
С уважением.
Об авторе:
Facta loquuntur.
Facta loquuntur.
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