The region between two concentric spheres of radii ‘a’ and ‘b’,respectively

The region between two concentric spheres  of radii ‘a’ and b,respectively (see figure),has volume charge density P  = A/r,where A is a constant and r is the distance from the centre. At the centre of the spheres is a point charge Q. The value of A such that the electric field in the region between the spheres will be constant, is :
12

  1. Q/2πa²
  2. Q/2π(b² – a²)
  3. 2 Q/π(a² – b²)
  4. 2Q/π a²
Anurag Mishra Professor Asked on 4th April 2016 in Physics.
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