A linear charge having linear charge density λ, penetrates a cube diagonally and it penetrates a sphere diametrically as shown below. What will be the ratio of flux coming out of the cube and the sphere?
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Solution
Charge enclosed in cube = λ×Diagonal
=λ×√3a Charge enclosed in sphere = =λ×Diameter =λ×2a ∴ϕcubeϕsphere=qcubeϵ0qsphereϵ0=√32