Finding surface charge density and electric field in a spherical conductor with cavity Griffith 2-36

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Griffith 2-36
Finding surface charge density and electric field in a sphere with cavity
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How to solve if the charge is not placed at centre! How to find the surface density?

shobhitkhajuria
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Tried using the formula you placed for surface charge density in a textbook question and got the wrong answer...

cailiwilliams