Acurrent carrying wire of length 37 cm is positioned perpendicular to a uniform magnetic field. if the current is 3.2 a and it is determined that there is a resultant force of 2.5 n on the wire due to the interaction of the current and field, what is the magnetic field strength?

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.