The temperature dependence of the resistance of a non-linear resistor is investigated in a laboratory having constant ambient temperature $T_0=20°\mathrm{C}$ As the temperature is raised to $T_1=100°\mathrm{C}$, the resistance changes abruptly from $R_1=50\Omega$ to $R_2=100\Omega$. On cooling the reverse abrupt change from $100\mathrm{\Omega } \mathrm{to} 50\mathrm{\Omega }$ takes place at T₂ = 90°C. When a voltage V = 80 volt is applied to the resistor, a periodically varying current is established in the circuit after some time. Assume Newton’s law of cooling is applicable to the resistor, the proportionality constant being d = 1.2 ${\mathrm{JK}}^{-1}{\mathrm{s}}^{-1}$. The heat capacity of the resistor is c = 3 J/K. Now answer the following question.