Consider the Circle cycle during which a system undergoes a clockwise circular cycle in the-Plane. The Circle cycle has its center at temperature has a radius of R, where|R|<|Tc|Required:a. Determine the thermal efficiency for the Circle cycleb. If R is fixed and Tc increases, does the thermal efficiency increase, decrease, or remain constant?c. If Tc is fixed and R increases, does the thermal efficiency increase, decrease, or remain constant?