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+//Example 21.1 // electron spin magnetic dipole moment 
+clc;
+clear;
+//given data :
+ub=5.6D-5;//electron spin magnetic moment in eV
+kbT=1/40;//approximate value kb(constant) & at room temperature  in eV
+u=ub/kbT;//formula
+if(u<1)
+    disp(u,"electron spin magnetic dipole moment & kbT/ub>>1")
+    
+   else
+       disp(u,"kbT/ub<<1 so it is  wrong")
+       end