<p>An a.c. circuit consists of a series combination of circuit elements &#39;X&#39; and &#39;Y&#39;. The current is ahead of the voltage in phase by&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mi mathvariant="normal">&#960;</mi><mo>/</mo><mn>4</mn></math>. If element &#39;X&#39; is a pure resistor of 100<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>&#937;</mi></math>, (i) name the circuit element &#39;Y&#39;, and (ii) calculate the rms value of current, if rms value of voltage is 141V. (iii) What will happen if the source is replaced by a dc source?</p>