Question:

An infinitely long metal cylinder of radius R and surface charge density σ is placed symmetrically with an imaginary surface of the shape of a prism. The length of prism is L and its 3 sides are all

An infinitely long metal cylinder of radius R and surface charge density σ is 
placed symmetrically with an imaginary surface of the shape of a prism. The length of prism is L and its 3 sides are all equal to 3R. The flux through the prism is :
1) πRLσ/3ɛ₀
2) πRLσ/2ɛ₀
3) πRLσ/ɛ₀
4) 2πRLσ/ɛ₀

An infinitely long metal cylinder of radius R and surface charge density σ is placed symmetrically with an imaginary surface of the shape of a prism. The length of prism is L and its 3 sides are all equal to 3R. The flux through the prism is : 1) πRLσ/3ɛ₀ 2) πRLσ/2ɛ₀ 3) πRLσ/ɛ₀ 4) 2πRLσ/ɛ₀