Question

pointed parts are avoided in electrostatic machine why?​

Answer 1

Answer:

David McAnenay is right, pointy things are much more prone to arcing and so-called “corona discharge”. The reason is simple. At the boundary between conductor (metal) and insulator (air), the electric field lines are perpendicular to the surface.

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Answer 2

Answer:

Leakage of charges from the sharp points or edges of conductor occurs due to dielectric breakdown in air due to high electric field at the sharp points or edges. That's why edges are avoided in electric machines. When the sphere is negatively charged, it means electrons have been added to it.

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