A long cylindrical shell carries positive surface charge 'σ' in the upper half and negative surface charge '−σ' in the lower half. The electric field lines around the cylinder will look like (figures are schematic and not drawn to scale)
The correct option is A The electric field inside the shell will be zero. So, there will no electric field lines inside. Outside the shell, the electric field lines will generate from positive charges radially to the surface and terminate at the negative charges, radially inwards to the surface. Option A is correct.