TS EAMCET Medical 9 May 2019 Shift 1 Paper

A rod of resistive material of length L is connected to a battery with potential difference 12 V. The resistance per unit length of the rod varies as ρ (x) = 12x Ω/m where x is the distance from one end of the rod. If the current hi the resistive rod transfer energy to thermal energy at the rate of 600 W. then the length of rod will be