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Comparing eq (1) and (2), we have: i. $2 \pi f t=100 \pi t \Rightarrow f=50 \mathrm{~Hz}$ ii. $I_o=20 \mathrm{~A}$ iii. $I_{R M S}=\frac{I_o}{\sqrt{2}}=\frac{20}{\sqrt{2}}=14 \mathrm{~A}$