The diagram shows apparatus that can be used to make a magnet. * 15)
(1/1 Points)
power supply
metal
coil
Which metal and which power supply are used to make a permanent magnet?
metal
power supply
A
iron
6 Va. c.
6Vd. c.
00
iron
C
steel
6 Va. c.
D
steel
6 Vd. c.

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.