The problem I\'m having is with Problem 64 in Chapter 21. The given info is: an

Question

The problem I'm having is with Problem 64 in Chapter 21.
The given info is:

an electric dipole has an electric dipole moment of p =5*10^-30
it is in an electric field, E = 1.6 * 10^6

part A asks to find the change in potential as the dipole movesparallel to the field to perpendicular...I can figure that out, theresult is U = 8*10^-24

but in Part B, it asks a weird question:

at what temperature T does the translational kinetic energy, 2/3kt,equal the change in U you found in part A?

you set it up like:

2/3kt = U
2/3kt = 8 * 10^-24

but at this point, the cramster solution subs in a value for kwithout explaining where it comes from.
k = -1.2 * 10^-23.

Where does this value of K come from? Thanks a lot!

Explanation / Answer

k is the Boltzmann constant, but it should be1.38E-23 J/K.

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