pererіau 2.8 mm
Объяснение:
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F = 0,05 H
Объяснение:
Дано:
q₁ = - 8·q
q₂ = + 4·q
F₁₂ = 0,4 Н
F₃₄ - ?
Поскольку заряды противоположных знаков, то они притягиваются с силой, равной по модулю:
F₁₂ = k·|q₁|·q₂ / r²
Отсюда:
r² = k·|q₁|·q₂ / F₁₂ = k·8·q·4·q / 0,4 = 80·k·q² (1)
После соединения и развода зарядов на прежнее расстояние, каждый из зарядов (по закону сохранения):
q₃ = q₄ = (-8+4)·q / 2 = - 2·q
Сила отталкивания по модулю будет:
F₃₄ = k·2·q·2·q / r² = 4·k·q² / r² (2)
И теперь, с учетом формулы (1), имеем:
F₃₄ = F = 4·k·q² / r² = 4 / 80 = 0,05 Н
