The electric potential (relative to infinity) due to a single point charge Q is 400 V at a point that is 0.800 m to the right of Q. The electric potential (relative to infinity) at a point that is 0.90 m to the left of 0 is:. A. + 400 V.
B.-400 V.
C. + 200 V.

Arefrigerator uses r-134a as the working fluid and operates on the ideal vapor-compression refrigeration cycle except for the compression process. the refrigerant enters the evaporator at 120 kpa with a quality of 34 percent and leaves the compressor at 70°c. if the compressor consumes 450 w of power, determine (a) the mass flow rate of the refrigerant, (b) the condenser pressure, and (c) the cop of the refrigerator. (0.00644 kg/s, 800 kpa, 2.03)