Four charge particles each having charge  Q=1  C are fixed at the corners of the base (A, B, C and D) of a square pyramid with slant length  a(AP=BP=PD=PC=a=2  m), a charge −Q  is fixed at point P. A dipole with dipole moment  p=1  Cm is placed at the centre of the base and perpendicular to its plane as shown in figure. Force on the dipole due to the charge particles is  x4πε0N. Find the value of x?