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Q.

S1  and  S2  are two hollow concentric spheres enclosing charge Q  and 2Q, respectively, as shown in figure. What is the ratio of the electric flux leaving through the surface of S1  and  S2  is  1K. Then the value of K is
 

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answer is 3.

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Detailed Solution

The charge enclosed by S1 is Q, so flux associated with it is Qε0.  

The charge enclosed by S2 is = 2Q + the charge enclosed by S1 which is Q = 3Q

so flux associated with it is 3Qε0.

Therefore, the ratio is 1 : 3. 

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