# There is some change in length when a 33000 N tensile force is applied on a steel rod of area of cross- section $10^{-3}m^2.$ The change of temperature required to produce the same elongation if the steel rod is heated, is (The modulus of Elasticity is $3 \times 10^{11}\;N/m^2$ and the coefficient of linear expansion of steel is $1.1 \times 10^{-5}/^{\circ}C)$.

$\begin {array} {1 1} (1)\;20^{\circ}C & \quad (2)\;15^{\circ} C \\ (3)\;10^{\circ}C & \quad (4)\;0^{\circ}C \end {array}$

$(3) 10^{\circ}C$