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 isQ10Q99Q1010Q11

Solution

## The correct option is A Q10Spheres have equal charge density   σ1=σ2 ⇒q4πR2=Q−q4π(3R)2(∵ combined charge on both the spheres is Q)  ⇒9q=Q−q ⇒q=Q10

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