Ascientist is giving a demonstration with a van de graaff generator in a class about electrostatics. the scientist can detect the type of charge on the van de graaff generator by
a) bringing a positively charged balloon near it.
b) seeing if it picks up bits of paper from a surface.
c) touching it with a metallic rod that conducts charge.
d) testing if it attracts a neutral sphere made of plastic.

A) bringing a positively charged balloon near it.

Explanation:

This is the correct answer because is the only option in which the object has a charge (a positive one in this case). That means when the scientist brings a positively charged balloon near the hollow metal globe on the top of the Van de Graaff generator a repulsion is seen it because the globe is positively charged too.

in physics zero. in muscle fatigue could be high

vapour or gas assuming atmospheriv pressure