Предмет: Физика, автор: Дима0001

Помогите пожалуйста решить!! желательно по подробнее

Плоский воздушный конденсатор емкостью 4 мкФ присоединили к источнику тока и сообщили ему заряд, 8*10^-4Кл. Какое напряжение будет на конденсаторе , если, отключив источник тока , уменьшить расстояние между обкладками в 2 раза? Найти изменение энергии конденсатора.

Ответы

Автор ответа: evgorlova

при отключении конденсатора от источника тока заряд не меняется
q=8*10^-4 Кл
C=εε0S/d
ε=1
d2=d/2 расстояние уменьшиться в 2 раза, емкость в 2 раза увеличиться
C2=2C=2*4мкФ=8мкФ
U2=q/C2
U2=8*10^-4/8*10^-6=100 B напряжение на конденсаторе, после того, как изменилось расстояние между пластинами
емкость увеличилась в 2 раза , энергия в 2 раза уменьшилась тк
W=q^2/2C формула энергии
ответ U2=100B W уменьшиться в 2 раза

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2- нет артикля

Long, long ago there lived 1 rich king. His name was 2 Midas. He was 3 greedy man and liked_4_gold very much. One day he asked gods of_5_Greece to give him 6 more gold. 7_gods decided to punish him and said: "Very well; in 8 morning anything that you touch with your hand will become 9_gold." 10 Midas was very happy when he heard this. "I shall be 11 richest man in 12 world," he thought.

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and 26 flowers looked beautiful.27 king took one of 28 flowers, but it

became_29_gold in_30 _ his hand. He was sorry that _31 flowers changed as soon

as he touched them. _32_king went to have _33_breakfast. He took_34_cup of 35 sweet milk, but 36 milk became _37_gold at once. Then he took 38 piece of 39 bread, and 40 bread also became 41 gold. 42 Midas no fel unhappy. It was good to be 43 richest man in 44 world, but he was hungry and he could not eat_45_gold.

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"Go",- said_55_gods, "and wash 56_ your hands in 57 river which is near your

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