Electrification by Friction and Types of Electric Charges

Flashcards covering experiments and principles of electrification by friction, electrostatic interaction rules, and the two types of electric charges.

What are the two primary objectives of the lesson on electrification by friction?

To demonstrate the phenomenon of electrification by friction and to determine the two types of electric charges.

In Experiment 1, what is observed when a pen rubbed in hair is brought close to small pieces of paper?

The small pieces of paper are attracted to the rubbed part of the pen.

In Experiment 2, what happens when the rubbed part A of a plastic ruler is brought near the suspended polystyrene ball?

The ball is attracted by the rubbed part of the ruler.

In Experiment 2, what happens when the non-rubbed part B of the plastic ruler is brought near the suspended polystyrene ball?

The ball is not attracted by the non-rubbed part of the ruler.

What conclusion is drawn from the plastic ruler and electrostatic pendulum experiment regarding the localization of charge?

During friction, electrification occurs, and the phenomenon of electrification remains localized to the rubbed region.

What are the two types of electric charges identified in the lesson?

Positive $(+)$ and negative $(-)$ charges.

What is the fundamental rule regarding the interaction between two electrified bodies?

Two bodies with the same sign repel each other, while two bodies with different or opposite signs attract each other.

What interaction occurs between a suspended glass rod A $(+)$ and another rubbed glass rod V $(+)$?

Repulsion.

What interaction occurs between a suspended glass rod A $(+)$ and a rubbed PVC rod $(-)$?

Attraction.

What interaction occurs between a suspended glass rod A $(+)$ and a rubbed Plexiglas rod P $(+)$?

Repulsion.

What interaction occurs between a suspended glass rod A $(+)$ and a rubbed Ebonite rod $(-)$?

Attraction.

According to the real-world application, why do hairs repel each other when they are brushed or backcombed?

When brushed, the hairs become electrified with the same sign of electric charge, causing them to repel one another.