A dielectric ball is polarized  uniformly  and statically. Its polarization equals `P`. Taking into
Channel: Doubtnut
Date: 30/08/2020

A dielectric ball is polarized  uniformly  and statically. Its polarization equals `P`. Taking into account  that a ball ploarized is this way may be represented  as a result  of a small shift of all positive chagres of the dielectric  relative to all negative charges,  (a) find the electric field  strength `E` inside  the ball, (b) demonstrate  that the field  outside  the ball is that of a dipole  located  at the centre  of the ball, the potential of that field  being  equal to `varphi = p_(0) r//4pi  epsilon_(0)`, where  `p_(0)`  is the electric moment of the ball, and `r` is the distance  from its  centre.