Why do we sometimes feel a small electric shock when we walk across a carpeted floor and touch a metallic doorknob?

Explanation

### Step-by-Step Solution

1. **Understanding Static Electricity**:
- When we walk across a carpeted floor, especially in dry conditions, we can accumulate static electricity. This happens due to the friction between our shoes and the carpet, which causes electrons to transfer from one surface to another.

**Hint**: Think about how rubbing two materials together can create an imbalance of charges.

2. **Charge Accumulation**:
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