A thick shell of inner radius R and outer radius 3R has uniform density ro C/m^3. It has a spherical cavity of radius R. The electric field at the center of the cavity is

A thick shell of inner radius R and outer radius 3R has uniform density ro C/m^3. It has a spherical cavity of radius R. The electric field at the center of the cavity is Gauss ' law 6. A thick shell with inner radius R and outer radius 3R has uniform density p clm3. It has a spherical cavity Of radius R as shown in the figure. The electric field at the centre 01 of the cavity is :- o o,