Illustration on line charge|Electric field due to surface charge|Surface charge density

Electric field due to point charge

Electric field due to a single charge is

Electric field lines due to charge

Electric Field Due to Variable Charge Density

Two charged metallic spheres of radii r_(1) and r_(2) are touched and separated. Calculated the ration of their (i) Charges (ii) Potential (ii) Self energy (iv) Electric field at the surface (v) Surface cahrge density