IOM 2018, Блиц, английски — Задача 26

OLYMPIAD OF METROPOLISES. Moscow, September 3 · 3 септември 2018 г.

Условие

When a point charge $q$ is at a distance $3R$ from the center of a metal sphere of radius $R$ the interaction force between the charge and the sphere is equal to zero. What is the charge of the sphere?

1. $\frac{15}{192}q$; 2) $\frac{17}{192}q$; 3) $\frac{5}{64}q$; 4) $\frac{7}{64}q$.

Отговори

Решение

Оригинал в Архива: blitz.pdf · официални решения: blitz-answers.pdf