Large conventional electromagnets use water cooling to prevent excessive heating of the magnetic coils. A large laboratory electromagnet has a current of 100 A when a voltage of 240 V is applied to the terminals of the energizing coils. To cool the coils, water at an initial temperature of 15 degree C is circulated around the coils. How many liters of water must circulate by the coils each second if the temperature of the coils is not to exceed 50 degree C?