9. CBQ - Electrostatic force

Question:

3 m.

Observe the image and answer the following questions.

Force and its effects

1. A plastic scale is rubbed with a polythene piece and brought near small pieces of paper. The paper pieces move towards the scale. What does this observation show?

The plastic scale becomes electrically charged after rubbing
The paper pieces become magnetic
The plastic scale loses its ability to attract objects
The plastic scale produces heat energy

2. Which force is responsible for the attraction between the plastic scale and the paper pieces?

Gravitational force
Electrostatic force
Muscular force
Frictional force

3. Why does the plastic scale attract the paper pieces even without touching them?

The force can act between objects without physical contact
The paper pieces produce their own force
The scale pushes air towards the paper pieces
The force acts only when objects are in contact

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