Two bodies, one hot and the other cold kept in vacuum. what will happen to the tempreture of bodies after some time.

How does the space charge width change with forward and reverse bias? also, calculate the space charge width for a reverse bias of 4v on a silicon pn junction at t = 300k and doping concentrations of na = 5x1015cm-3 , nd = 5x 1016 cm-3 .

As the distance from a magnet increases, what happens to the magnet force?

What quantity do units represent in value