Два вантажі масами 250 і 300 г зв'язані ниткою і лежать на гладенькій горизонтальній поверхні столу. З яким прискоренням рухатимуться вантажі, якщо до більшого вантажа прикласти силу 1,5 Н, напрямлену паралельно площині стола? Якої сили натягу буде при цьому зазнавати нитка, що зв'язує тіла?
Ток в этой системе в установившемся режиме течет через только резисторы.
Эквивалетное сопротивление цепочки резисторов равно
Значит по закону Ома ток через эту цепь (и через левый резистор) составит
А падение напряжения на нем
Батарея конденсаторов подключена параллельно источнику, поэтому их суммарная разность потенциалов равна E. Эквивалентая емкость этой батареи
Заряд конденсаторов одинаков (последовательное соединение) и равен
Разность потенциалов на левом конденсаторе равна
Таким образом, потенциал точки A на 2E/3 больше потенциала левой клеммы источника, а потенциал точки B на Е/2 больше потенциала левой клеммы источника.
Разность U_A - U_B = 2E/3 - E/2 = E/6
Объяснение:
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