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 is showing the direction that electrons move in, making the sphere positive."

Explanation: the positive rod attracts electrons from the neutral sphere when they touch, so electrons flow from the sphere to the rod. That loss of electrons leaves the sphere with a net positive charge. (Protons in the material do not move.)