A glass rod is rubbed with silk . Will its mass increase or decrease ?

Explanation

### Step-by-Step Solution:

1. **Understanding Initial Conditions**:
- Both the glass rod and the silk are initially electrically neutral. This means that the number of protons (positively charged) equals the number of electrons (negatively charged) in both materials.

2. **Rubbing the Glass Rod with Silk**:
- When the glass rod is rubbed with silk, electrons are transferred from the glass rod to the silk. This is due to the triboelectric effect, where certain materials become charged when they are rubbed together.

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