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537. Колебательный контур состоит из конденсатора емкостью C = 0,025 мкФ и катушки с индуктивностью L = 1,015 Гн. Омическим сопротивлением катушки пре-небречь. В начальный момент времени заряд конденсатора q = 2,510-6 Кл. Найти значение периода колебаний, а также энергии электрического и магнитного полей, а также полную энергию в момент времени Т/8.
По формуле Томсона период колебаний в контуре равен T = 2π√(LC) = 2 • π • √(1,015 • 0,025 • 10-6) ≈ 1,0 • 10-3 (с) = 1,0 мс.
Разность потенциалов на обкладках конденсатора изменяется по закону U(t) = Um • cos ωt = q/C • cos 2πt/T = = 2,5 • 10-6/(0,025 • 10-6) • cos 2πt/(1 • 10-3) = 100 • cos (2 • 103 • π • t). В момент времени t = T/8 разность потенциалов на обкладках конденсатора составляет U(T/8) = 100 • cos (2 • 103 • π • 1 • 10-3/8) = = 100 • cos π/4 (В). Значение электрической энергии в момент времени t = T/8 равно WC(T/8) = C • U2(T/8)/2 = 0,025 • 10-6 • (100 • cos π/4)2/2 = 0,0000625 (Дж).
Ток в контуре изменяется по закону I(t) = C • dU/dt = -C • Um • 2π/T • sin 2πt/T = = -0,025 • 10-6 • 100 • 2 • 103 • π • sin (2 • 103 • π • t) = -5,0 • 10-3 • sin (2 • 103 • π • t). В момент времени t = T/8 значение тока равно I(T/8) = -5,0[size=3]• π[/size] • 10-3 • sin π/4 (А). Значение магнитной энергии в момент времени t = T/8 равно WL(T/8) = L • I2(T/8)/2 = 1,015 • (-5,0 • 10-3 • sin π/4)2/2 ≈ 6,34 • 10-60.0000625 - точное значение, полученное на Excel при подстановке точного значения T = 1.000882034 мс (Дж).
Полная энергия контура в [size=3]любой[/size] момент времени, (в т.ч. и в момент времени t = T/8) составляет W(T/8) = WC(T/8) + WL(T/8) ≈ 0,0625 0.000125, что совпадает с величиной, полученной по ф-ле C • U[sub]m[/sub][sup]2[/sup]/2 Дж.
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