Question

why are lightning conductors pointed

Answer 1

The sharp points are important because the electric field near the tip builds large values. The air is therefore more likely to ionize near the tip than anywhere else with a smaller field. That means that current can start flowing there, rather than somewhere else, so it flows directly to the conducting rod.

Answer 2

this is because these pointed conductors help to attract electricity nd thus take it more effectively to the ground this makes less chances of it getting it hit by the building.