Question

two isolated metal spheres A and B having radius R and 2r respectively and same charge Q find which of two spheres have greater energy density just outside the surface of the sphere

Answer 1

as we know that, u= 1/2ۥ E^2.
or, E= q/ Aۥ
than, u is directly proportional to 1/A
than,. obviously, Ua> Ub.

here,
ۥ means= eflsyln note.
E means electric field.