a scientist is giving a demonstration with a van de graaff generator in a class about electrostatics. the…

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\na bringing a positively charged balloon near it.\nb seeing if it picks up bits of paper from a surface.\nc touching it with a metallic rod that conducts charge.\nd testing if it attracts a neutral sphere made of plastic.

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\na bringing a positively charged balloon near it.\nb seeing if it picks up bits of paper from a surface.\nc touching it with a metallic rod that conducts charge.\nd testing if it attracts a neutral sphere made of plastic.

Answer

Brief Explanations:

Charges interact according to the rule of like - charges repel and opposite - charges attract. A positively charged balloon can be used to determine the charge of the Van de Graaff generator by observing if there is attraction or repulsion. Picking up bits of paper (B) only shows it is charged, not the type. Touching with a metallic rod (C) just transfers charge, not identify the type. Attracting a neutral plastic sphere (D) only shows it is charged, not the charge type.

Answer:

A. bringing a positively charged balloon near it.