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66. Заряженная частица прошла ускоряющую разность потенциалов U=104 В и вошла в скрещенные под прямым углом однородные электрическое (E=10000 В/м) и магнитное (В=0,1 Тл) поля. определить удельный заряд q/m частицы, если она, двигаясь перепендикулярно обоим полям, не испытывает отклонение от прямолинейной траектории.
77. Тонкий металлический стержень длинной l=50см вращается в однородном магнитном поле с индукцией В=10мТл вокруг перпендикулярной к стержню оси, отстоящей от одного из его концов на расстоянии а=25см на продолжении стержня, делая n=100 об/мин. Найти разность потенциалов U, возникающую между концами стержня, если угол между осью вращения и вектором магнитной индукции равен a=60 градусов.
92. Свободно вращающаяся рамка с током I=0,5А помещается в однородное магнитное поле. Определить индукцию В поля, если период малых колебаний рамки Т=1с, площадь рамки S=0,0314кв.м, момент инерции J=0,0001 кг*кв.м. ось вращения перпендикулярна вектору магнитной индукции.
113. Плотность тока j в длинном медном проводе диаметром d=1,2см равна 2,5А/кв.см 1) Найти напряжённость Н магнитного поля на растоянии r=6мм от оси проводника 2) Вычислить магнитный поток Фm внутри провода, приходящийся на L=1м его длины.(имеется в виду поток, пронизывающий одну из половин осевого сечения провода)
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19.05.2007, 07:26
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Здравствуйте, Костенко Дмитрий Александрович!
66. Если частица не испытала отклонений и продолжила двигаться прямолинейно, то сила, действующая со стороны магнитного поля компенсирует силу, действующую со стороны электрического поля. F=q*V*B; - сила действующая со стороны магнитного поля F=E*q; - сила действующая со стороны электрического поля Если заряд прошел разницу потенциалов то: (m*V^2)/2=q*U; - изменение кинетической энергии(начальную скорость будем считать нулем) равно работе. V=sqrt((2*q*U)/m); Приравняем два первых уравнения и подставим V; q* sqrt((2*q*U)/m)*B=E*q; 2*q*U*B^2/m=E^2; q/m=E^2/2*U*B^2;
77. Пускай T=t; w(омега)=a/t=a*n;(Надо n перевести в об/с); X - расстояние от оси к проводнику; За это время проводник «заметет» сектор S=w*t*(L+X)^2/2; Но не следует забывать, что сам проводник заметет несколько меньшую площадь: S=w*t*((L+X)^2-X^2)/2; Ф=B*S; ЭДС=U=Ф/t= a*n*((L+X)^2-X^2)/2;
92. Пускай Е - эпсилон, вектор углового ускорения Момент инерции J=m*r^2; M=E*J; E=dw/dt; dt=T; w=2*П/T; E=2*П/T^2; M=I*B*S; - момент силы, которая действует на рамку. M=E*J; Приравняем эти формулы I*B*S=2*П*J/T^2; B=2*П*J/I*S*T^2
113. Проводник создает вокруг себя магнитное поле с напряженностью: H=I/2*П*r; Ток в проводнике равен: I=J/S=J/2*П*(d/2)^2; S1=L^2; B=m0*H; Ф=B*S1= m0*H*J*L^2/(2*П*(d/2)^2); m0(магнитная постоянная 4*П*10^-7 Гн/м)
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