A thick hollow metallic sphere of Inner and outer radius 2a and 4a, respectively, encloses a sold concentric metallic sphere of radius a'. These spheres are connected to the earth through switches S_1 and S_2 as shown in the figure First, switch S_1 is closed and after some time S_1 is opened. Then, S_2 is closed and after some time S_2 is opened. This completes one cycle. Initially, charge Q is given to the outer sphere with both S_1 and S_2 open. The charge on the inner sphere after n cycles of earthing the inner and outer spheres is

A thick hollow metallic sphere of Inner and outer radius 2a and 4a, re

1.	A thick hollow metallic sphere of Inner and outer radius 2a and 4a, respectively, encloses a sold concentric metallic sphere of radius a'. These spheres are connected to the earth through switches S_1 and S_2 as shown in the figure First, switch S_1 is closed and after some time S_1 is opened. Then, S_2 is closed and after some time S_2 is opened. This completes one cycle. Initially, charge Q is given to the outer sphere with both S_1 and S_2 open. The charge on the inner sphere after n cycles of earthing the inner and outer spheres is
Answer» `-Q/3` `-Q/3^n` `-(2/3)^2Q` `Q/3^n` ANSWER :B

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