JEE Advanced 2020 Physics question
A circular disc of radius carries surface charge density , where is a constant and is the distance from the center of the disc. Electric flux through a large spherical surface that encloses the charged disc completely is . Electric flux through another spherical surface of radius and concentric with the disc is . Then the ratio is .
Answer: 6.4
Solution
By Gauss's law the flux is proportional to the enclosed charge, so . Charge within radius : . For : $ =
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