If the system were lossing heat according to Newton's cooling law the temperature of the mixture would change with time according to (while heater was on) .

Options

A.
B.
C.
D.

Explanation

As the temperature increases heat loss to surrounding increases After some time the rate at which heat is lost become equal to rate at which heat is supplied and an equilibrium or steady state is achieved Hence temperature becomes constant after some time `:.C` is correctr .