ЭДС индукции находится по формуле e=-(дельтаФ/дельтаt)
Магнитный поток Ф=BSNcosa (если иного не сказано, будем считать a=90 градусов), Ф=BSN.
Ф=e*t (из первой формулы)
Ф=2*1=2Вб
Ф(для одного)=2/200=0,01 Вб
Значит, что давление атмосферы точно такое, какое оказывает столбик ртути высотой 750 мм.
U0=3u0;s=u-u0/t; S=3u0-u0/t=2u0/t;u0=st/2;u0=20 м^2c/2=10 м/c
N2=10
U1=220B
U2=1,1B
N1 - ?
N1/N2=U1/U2 ⇒N1=U1/U2*N2
N1=220/1,1*10=2000 витков
Ответ: N1=2000 витков
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