I need some help with a physics problem. This specifically relates to Statistical and Thermal Physics. This question is NOT related to BIOLOGY or CHEMISTRY/CHEMICAL ENGINEERING, so please don't respond with an answer for those subjects. Thanks.

For an isolated system consisting of a large number links of polymer chain near a big cell membrane, where each link has distance , and each link is equally likely to be directed to the right or left, the end of each link is electrically charged so that the electric dipole is induced on each link. The cell membrane is charged electrically and produces a large electric field . Each link aligns to the

electric field, resulting in the polymer folding to the left or right. The energy of each link can be expressed as .

After folding the polymer chain, mean head-to-tail length is .

Question I need help with, please show all steps involved:

1. What is the mean energy as a function of temperature ?

1 1 E E = 6 > -P E 3