Question

Find the flux through the disc

Answer 1

Answer:

Explanation:

This flux originates in a solid angle 4π. In the given case the solid angle subtended by the cone subtended by the disc at the point charge is Ω=2π(1−cosθ). So the flux of q which is passing through the surface of the disc is, ϕ=qε0Ω4π=q2ε0(1−cosθ).