Предмет: Физика, автор: rodaodessa61

ДАМ 100 БАЛОВ. СРОЧНО!!!

Дві однакові маленькі заряджені кульки перебувають на відстані 4 см
одна від одної. Заряд однієї з них 8 нКл, а заряд другої — 2нКл.
Кульки привели в дотик і знову розсунули на початкову відстань.
Визначте силу взаємодії кульок до та після дотику.

Ответы

Автор ответа: zinovicgrigorij
3

Ответ: 9*10⁻⁵Н; 5*10⁻⁵Н

Объяснение:

Дано:

q1=8нКл=8*10⁻⁹Кл

q2=-2нКл=-2*10⁻⁹Кл

r=4cм=0,04м

k=9*10⁹Н*м²/Кл²

-----------------------

F1-?; F2-?

F=k*|q1|*|q2|/r², где:

k-коэффициент пропорциональности;

q1 и q2-заряды;

r-расстояние между зарядами

F1=9*10⁹*2*10⁻⁹*8*10⁻⁹/0,04²=9*10⁻⁵Н

После соприкосновения шариков их заряды равны:

q=(q1+q2)/2=(-1+8)/2=3нКл=3*10⁻⁹Кл

Сила взаимодейстия между ними стала:

F2=9*10⁹*3*10⁻⁹*3*10⁻⁹/0,04²=5*10⁻⁵Н


rodaodessa61: Большое спасибо!
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