What kind of electric charge is acquired :
by a glass rod rubbed with silk cloth ?

Options

A. Positive
B. Negative
C. Both A and B
D. None of these

Answer

To determine the kind of electric charge acquired by a glass rod when it is rubbed with silk cloth, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Materials**: Recognize that we are dealing with two materials: a glass rod and silk cloth.

2. **Rubbing Action**: When the glass rod is rubbed with the silk cloth, friction occurs between the two materials.

3. **Electron Movement**: During this rubbing process, electrons (which are negatively charged particles) move from one material to the other.

4. **Charge Acquisition**:
- The glass rod loses electrons to the silk cloth.
- As a result, the glass rod ends up with a deficit of electrons.

5. **Resulting Charge**:
- Since the glass rod has lost electrons, it becomes positively charged (because losing negatively charged electrons results in a net positive charge).
- Conversely, the silk cloth gains those electrons, making it negatively charged.

6. **Conclusion**: Therefore, after rubbing the glass rod with silk cloth, the glass rod acquires a **positive charge**.

### Final Answer:
The glass rod acquires a **positive charge** when rubbed with silk cloth.

---