Bài 1:
\(\left|e_c\right|=\left|\dfrac{1,2-0,6}{60}\right|=0,01\) (V)
Bài 3:
\(L=4\pi.10^{-7}.N^2.\dfrac{S}{l}\)
\(=4\pi.10^{-7}.1000^2.\dfrac{10^{-3}}{0,5}\)
\(=2,512.10^{-3}\left(H\right)\)
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