Problem 4.38. Two magnetic systems in thermal contact Consider two isolated systems of noninteracting spins with Na = 4 and NB = 16. Their initial energies are EA = -2µB and Eg = –-2µB. (a) What is the total number of microstates available to the composite system? (b) Ifthe two systems are now allowed to exchange energy with one another, what is the probability that system A has energy EA?

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