Electric Field & Field Lines
A long cylindrical shell carries positive surface charge in the upper half and negative surface charge - in the lower half. The electric field lines around the cylinder will look like figure given in: (figures are schematic and not drawn to scale)
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Answer: (c)
- The cylinder behaves like an electric dipole: positive charge on top, negative below.
- Outside, field lines leave the positive upper half, curve around the sides and end on the negative lower half.
- Lines start on and end on only; they do not go radially outwards to infinity from both halves.
- So the answer is (c).