A pure resistive circuit element X when connected to an AC supply of peak voltage 200 V gives a peak current of 5 A which is in phase with the voltage. A second circuit element Y, when connected to the same AC supply also gives the same value of peak current but the current lags behind by 90°. If the series combination of X and Y is connected to the same supply, what will be the rms value of current?
amp
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Text Solution
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As current is in phase with the applied voltage, 
must be 
.
As current lags behind the voltage by 
must be an inductor.
In the series combination of 
and 
,
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