A circuit element shown in the figure as a box is having either a capacitor or an inductor. The ...

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A circuit element shown in the figure as a box is having either a capacitor or an inductor. The power factor of the circuit is \( 0.8 \), while current lags behind the voltage. Find
(a) the source voltage \( V \),
(b) the nature of the element in box and find its value.
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