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A pure inductor has power factor of 

 (a) 1 (b) 1/ 2 (c) 0 (d) None of these 

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(c) 0.

Pure inductor never consumes power
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0 because power factor cos(angle)= cos(angle between voltage and current) and for pure inductor the angle=90 degree. so the value of power factor is zero..
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The current lags behind voltage by 90 degrees in case of a pure inductor 

Therefore the power factor = cos{angle between voltage and current} 

= cos(90) = 0

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