[" A steel rod of length "2l," cross-sectional area "A" and mass "M],[" is set rotating in a horizontal plane about an axis passing "],[" through the centre.If "Y" is the Young's modulus for steel."],[" The extension in the length of the rod is (assume the rod is "],[" uniform) "],[[" (a) "(2)/(3YA)mu omega^(2)ell^(2)," (b) "(2 omega^(2)ell^(2))/(3 mu YA)],[" (c) "(5 mu omega^(2)ell^(2))/(3A)," (d) None of these "]],[" (c) "(5 mu omega^(2)ell^(2))/(3A)," (d) None of these "]