Question

A positive rod is touched to a neutral sphere.

There is a bar with positively charged particles attached to a ball with positive and negative charged particles.

Which best explains the arrow’s purpose in the diagram?

It is showing the direction that protons move in, making the sphere negative.
It is showing the direction that protons move in, making the sphere positive.
It is showing the direction that electrons move in, making the sphere positive.
It is showing the direction that electrons move in, making the sphere negative.

Answer 1

It’s showing electrons moving, making the sphere positive.

Explanation: in a conductor only electrons move. A positively charged rod pulls electrons off the neutral sphere (electrons flow toward the rod), so the sphere loses electrons and becomes net positive.