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The resistance of an electrical toaster has a temperature dependence given by R(T)=R0[1+α(TT0)] in its range of operation. At T0=300K,R=100and atT=500K,R=120. The toaster is connected to a voltage source at 200V and its temperature is raised at a constant rate from 300 to 500K in 30s. The total work done in raising the temperature is

(1)400n1.51.3J(2)200n23J(3)400n56J(4)60,000n65J

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