Точка b находится в середине оирезка ac. неподвижные точечные заряды 2q и -q расположены в точках а и с соответсвенно.какой заряд надо поместить в точку с взамен заряда -q,чтобы напряженность электрического поля в точке b увеличилась в 2 раза варианты ответов: 1) 2q; 2)-2q; 3) 4q; 4) -4q объясните подробно как решать данное
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