申論題

10. The figure shows three situations in which the same charged particle is surrounded by a concentric Gaussian sphere.

(1) sphere has radius R

(2) sphere has radius 2R 

(3) sphere has radius 2R and also surrounds a neutral metal spherical shell

Rank the three situations according to the magnitude of the electric flux through the surface of the Gaussian sphere, greatest first. NOTE:請依序排列,並加註大於、小於、或等於符號(＞, ＜, or =)。