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 =)。