two concentric metallic spherical shells of radii R and 2R are given charges Q1 and Q2 respectively .the surface charge densities on the outer surfaces of the shells are equal .determine the ratio Q1:Q2

                                             
      Surface Charge density ,σ = charge / surface area
      Surface Charge density of the metallic shell of radius R and charge Q1 is
                                          σ1 = Q1/4πR2  
      Similarly, Surface Charge density of the metallic shell of radius 2R and charge Q2,
                                          σ2 = Q2/4π(2R)2  

                             Given,   σ1  = σ2

                                   Q14πR2=Q24π(2R)2  Q1Q2   = 14            

 
                                                         

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