Let `P(r)=(Q)/(piR^4)r` be the charge density distribution for a solid sphere of radius R and total charge Q. For a point 'p' inside the sphere at distance `r_1` from the centre of the sphere, the magnitude of electric field is:

Let rho(r)=(Qr)/(piR^(4)) be the charge density distribution for a soild sphere of radius R and total charge Q. For a point P inside the sphere at a distance r_(1) from the centre of the sphere, the magnitude of electric field is

A hollow metal sphere of radius R is uniformly charged. The electric field due to the sphere at a distance r from the centre

A hallow metal sphere of radius R is uniformly charged. The electric field due to the sphere at a distance r from the centre: