What will you observe when the metal top of an electroscope is touched with :
a negatively charged object ?

Explanation

To solve the question, "What will you observe when the metal top of an electroscope is touched with a negatively charged object?", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Electroscope**:
- An electroscope is a device that detects electric charge. It consists of a metal top (cap) and metal leaves (usually made of gold or aluminum) that hang down inside a glass container.

2. **Initial Condition**:
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