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A device X is connected across an ac sou...

A device X is connected across an ac source of voltage `V=V_0sinomegat`. The current through X is given as `I=I_0sin(omegat+pi/2)`.
Identify the device X and write the expression for its reactance.

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Device X is a capacitor
`therefore` Capacitive reactance , `X_C=1/(omegaC)=1/(2pifC)`
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