Finding charge on conducting sphere

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To find the charge on a conducting sphere with a radius of 0.15m and a potential of 200V, the relationship between charge (Q), surface area (A), and surface charge density (σ) is essential. The surface area of the sphere is calculated as 0.28274 m². The charge can be determined using the formula Q = σ * A, where σ is the surface charge density. The potential V is related to charge and radius by the equation V = Q / (4πε₀r). By rearranging this equation, the charge can be calculated as Q = 4πε₀rV.
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I need to find the charge and charge density on the surface of a conducting sphere of radius r=0.15m and of a potential of V=200V.

I know the surface charge density, which is Q/A. The surface area is 0.28274, but I can't find the charge.
 
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