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OpenStudy (anonymous):
consider a system of two ising spins S1 and S2 taking values + or - 1 with interaction energy given by -JS1S2,when it is in thermal equilibrium at temperature T,the avrage energy of the system varies as C/TKb,with C is given by, a) -2(J square) b) -(J square) c) (J square) d) 4J Kb is boltzman constant
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