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Question

Charge Q is distributed on two metallic spheres having radii R and 3R such that both spheres have equal charge density then charge on smaller sphere is
  1. Q10
  2. Q9
  3. 9Q10
  4. 10Q11


Solution

The correct option is A Q10
Spheres have equal charge density
  σ1=σ2
q4πR2=Qq4π(3R)2( combined charge on both the spheres is Q) 
9q=Qq
q=Q10

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