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cho mach dien gom 12 nguon, co 3 nhanh mac song song, moi nhanh co 4 nguon noi tiep, $\varepsilon_0=2V, r_0=0,3\Omega$ , mach ngoai co dien tro R nhung trong 1 nhiet luong ke dung nuoc m=200g. Binh dien phan dung dd ax mac song song dong co. a) sau 4 phut10s, nhiet luong ke tang them 1,2do C.tim I, cho $R=1\Omega . $ 3) tim u giua 2 diem $c,d.$
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