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Impedance and current in the circuit

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For the circuit shown in attachment, find the combined impedance of the 160 uH inductor and 10uF capacitor when w=25 M rad/s.

Then find i(t) when Vs(t)=20 cos (wt+pi/4) and w=25 M rad/s.

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It mentions the formula used and gives the final computed value.

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