a long solenoid, of radius a, is driven by an alternating current, so that the field inside is sinusoidal: b(t) = b, cos(wt)ż. a circular loop of wire, of radius a/2 and resistance r, is placed inside the solenoid, and coaxial with it. find the current induced in the loop, as a function of time.

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)