Arectangular loop with dimensions 4.20 cm by 9.50 cm carries current i. the current in the loop produces a magnetic field at the center of the loop that has magnitude 3.10×10−5 t and direction away from you as you view the plane of the loop. part a what is the magnitude of the current in the loop?

A47.2 g block of copper whose temperature is 480 k is placed in an insulating box with a 91.8 g block of lead whose temperature is 200 k. (a) what is the equilibrium temperature of the two-block system? (b) what is the change in the internal energy of the two-block system between the initial state and the equilibrium state? (c) what is the change in the entropy of the two-block system? the heat capacities of copper and lead are 386 j/kg·k and 128 j/kg·k, respectively.