A conic surface is placed in a uniform electric field E as shown such that field is perpendicular to the surface on the side AB. The base of the cone is of radius R and height of the cone is h. The angle of cone is θ as shown. Find the magnitude of that flux which enters the cone's curved surface on the left side. Don’t count the outgoing flux.
Axis of a hollow cone shown in figure is vertical. It’s base radius is ‘R’. It is kept in a uniform electric field E parallel to its axis.
The magnitude of flux through curved part of the cone?