A fully charged parallel-plate capacitor remains connected to a battery while you slide a dielectric between the plates. The stored charge (Q) will: a. decrease
b. increase
c. stay the same
d. none of the above

Refrigerant-134a flows through a carnot heat pump cycle at 0.5 kg/s. it is known that the maximum absolute temperature in the cycle is 1.1 times the minimum absolute temperature, and the net power input to the cycle is 2.5 kw. if the refrigerant changes from a saturated vapor to a saturated liquid during the heat rejection process, determine the maximum magnitude of the enthalpy of vaporization for this process in kj/kg (with 3 significant figures).