Liquid crystal (LC) displays are found in digital watches and calculators. The display is made from two parallel pieces of glass separated by 1.0 × 10–5m with liquid crystal molecules between them. The glass is coated with conducting material.
The LC molecules have a permanent dipole - that is, they are positive at one end of the molecule and negative at the other. The normal state of these molecules is to be aligned parallel with the glass surfaces as in diagram A. If a voltage of 1.5 V is applied as shown, the molecules align with the electric field.
a) On diagram A, show the forces acting on the molecule as the switch S is closed.
b) On diagram B, draw field lines to represent the electric field in the central region of the plates.
2. The attempt at a solution
I drew the field line for part (b), is it correct? Also, I don't know how to draw the force for part (a), how would I show the force? Thanks in advance.