Because,Zg Zg was given r g +jxg, soits magnitude Zg=√it is capital R √R g 2+ it is it is capital, X it is also capital Xcapital Xg 2, sothat is whyRL=√ sorry magnitude of Zg.
क्योंकि, Zg =rg+jxg, मैगनीटुड दिया गया है, यह कैपिटल Xg2 भी है|