Question

A scientist 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.

Answer 1

I believe the answer is A) bringing a positively charged balloon near it.

Answer 2

A) bringing a positively charged balloon near it.

Step-by-step 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.