An electromagnet produces a magnetic field of 0.530 t in a cylindrical region of radius 2.80 cm between its poles. a straight wire carrying a current of 10.7 a passes through the center of this region and is perpendicular to both the axis of the cylindrical region and the magnetic field. what magnitude of force does this field exert on the wire?

Acommercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at -35°c by rejecting waste heat to cooling water that enters the condenser at 18°c at a rate of 0.25 kg/s and leaves at 26°c. the refrigerant enters the condenser at 1.2 mpa and 50°c. if the compressor consumes 3.3 kw of power, determine (a) the mass flow rate of the refrigerant, (b) the refrigeration load, (c) the cop, and (d) the minimum power input to the compressor for the same refrigeration load.