p33_021 - 21. (a) We compare this expression for the...

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21. (a) We compare this expression for the current with i = I sin( ωt + φ 0 ). Setting ( ωt + φ ) = 2500 t +0 . 680 = π/ 2, we obtain t =3 . 56 × 10 4 s. (b) Since ω = 2500 rad / s=( LC ) 1 / 2 , L = 1 ω 2 C = 1 (2500 rad / s) 2 (64
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