  A numerical method of determining the wire sag in a multiwire proportional
chamber used in RICH (ALICE) by solving the second order differential equation
which governs the wire stability has been presented. The three point Finite
Difference Method (FDM) has generated a tridiagonal matrix equation relating
the deflection of wire segments to the force acting on it. The precise
estimates of electrostatic force has been obtained from accurate field
computation using a nearly exact Boundary Element Method (neBEM) solver.
