we may meS^oiwir\[^lQ^'^'iiai lo labio arii snignBfi'J . ix = ic in oias 



The y gradient of the potential at .Ti produces a velocity at .T2 



y, = ^ r (^JL) e--^--^'' dx, . (h26) 



Wo J-00 \oy/i ' 



It produces a displacement at Xo 



y2 = ^ r (^) (X2 - xOe-^-''^'-'^' dx, . (h27) 



Wo J_oo \^y/i 



Writing the total power as 



p = p^^ P^_ (h28) 



We have the two contributions from (h22) and (h23) using (h9) 

 and 



4Fo ^-00 ^-« 



Again, we will turn to mathematical manipulation disregarding the 

 physical significance of the variables. If we change the order of integra- 

 tion, (h30) becomes 



4Fo 



Integrating with respect to Vo by parts we obtain 



-£/:(as)>'-'--)- 



The first term is zero because I — — I is zero at .Vi = — 00 and (.V2 — Xi) is 



\dy/ 



