the enure wire. what will be the diameter of your 81. | | | CALC a. Derive an expression for the magnetic field strength at distance d from the center of a straight wire of finite length I that carries current I. b. Determine the field strength at the center of a current-carrying square loop having sides of length 2R. c. Compare your answer to part b to the field at the center of a circular loop of diameter 2R. Do so by computing the ratio Bsquare / Bcircle.62. ||| A cube of water 10 cm on a side is placed in a microwave beam having Ey = 11 kV/m. The microwaves illuminate one face of the cube, and the water absorbs 80% of the incident energy. How long will it take to raise the water temperature by 50C? Assume that the water has no heat loss during this time