Two concentric imaginary spherical surfaces of radius R and

Two concentric imaginary spherical surfaces of radius R and 2R respectively surround a positive point charge Q located at the center of the surfaces. When compared to the electric flux 1 through the surface of radius R, the electric flux 2 through the surface of radius 2R is

a. 2 = 1/41

b. 2 = 1/21

c. 2 = 1

d. 2 = 21

e. 2 = 41

Please give as much detail.

Solution

the flux is depending on the charge, in this case both spherical surfaces have the same charge, so the flux through both surafces are the same. that is, 2 = 1. therefore, option (c) is correct answer.