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posted by  ekdoteen on 7/31/2008 9:49:15 AM  |  status: Live  

Magnetism

Course Textbook Chapter Problem
Calculus Based Physics Fundamentals of Physics Extended (8th) by Resnick, Halliday, Walker 32 40P
Question Details:
A 0.67 T magnetic field is applied to a paramagnetic gas whose atoms have an intrinsic magnetic dipole moment of 1.1 x 10-20 J/T. At what temperature will the mean kinetic energy of translation of the atoms equal the energy required to reverse such a dipole end to end in this magnetic field?
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posted by Steve (retired) on 7/31/2008 3:55:55 PM  |  status: Live
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ekdoteen's comment:
"Thanks bro"
Response Details:
Kinetic energy of the gas molecule from the kinetic theory of the gases is E = 3/2(KT) = 2μB
 
then from the above equation we get  T = 4μB/3K
 
K = 1.38 x 10-23 J/K
 
B = 6.7T
 
μ = 1.1 × 10–20 J/T
 
plug the values in the above expression and get the temperature
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