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cho doan mach RLC mac noi tiep ,cuon day thuan cam .Dat vao 2 dau doan mach dien ap u=120$\sqrt{2}$cos$\omega $t.Khi $\omega_1=\omega$=100$\pi$ thi dong dien som pha hon dien ap goc $\pi$/6 va co gia tri hieu dung la 1A.Khi$\omega$=$\omega$1=100$\pi$ va $\omega$=$\omega$2=400$\pi$ thi dong dien trong mach co cung gia tri hieu dung.L=?
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