Calculate the amount of work done in rotating a dipole, of dipole moment 3 x 10-8Cm, from its position of stable equilibrium to the position of unstable equilibrium of uniform electric field 104N/C..
w.d= -P*E(COS X2-COSX1)
HERE,X1=COS0=1(STABLE)
X2=COS180=-1(UNSTABLE)
SO, W.D=3*10^-8 *10^4 *(1+1) (MINUS SIGNS CANCELLED)
=48*10^-4 J.....