Sinusoidal expression for the current, Electrical Engineering

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The voltage across a 1 - μF capacitor is given. Which is the sinusoidal expression for the current?

a) 30 sin200t

b) 70cos (800t - 20°)

At what frequency will the reactance of a 1 - μFcapacitor equal the resistance of a 2 kΩ resistor?

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