A heat engine absorbs heat $q_1$ from a source at temperature $T_1$ and heat $q_2$ from a source at temperature $T_2$. Work done is found to be $J (q_1 +q_2)$. This is in accordance with :

Question

( A ) none of the above
( B ) first law of thermodynamics
( C ) Joules equivalent law
( D ) second law of thermodynamics