[" 15.Two rings "A(2m,R)" and "B(m,R)" are placed such that "],[" these are perpendicular but common center.The M.I.of "],[" the system about an axis passing through the common "],[" center and perpendicular to the plane of "B" is "],[[" (1) "(1)/(2)mR^(2)," (2) "mR^(2)],[" (3) "(3)/(2)mR^(2)," (4) "2mR^(2)]]