When a body is negatively charged by friction, it means

Options

A. the body has acquired excess of electrons
B. the body has acquired excess of protons
C. the body has lost some electrons
D. the body has lost some neutrons

Answer

To solve the question "When a body is negatively charged by friction, it means," we will analyze the options provided and determine the correct answer step by step.

### Step-by-Step Solution:

1. **Understanding Charge**:
- A body can have a positive charge, a negative charge, or be neutral.
- A negatively charged body indicates that it has more electrons than protons.

2. **Effect of Friction**:
- When two bodies are rubbed against each other, electrons may transfer from one body to another.
- The body that gains electrons becomes negatively charged, while the body that loses electrons becomes positively charged.

3. **Analyzing the Options**:
- **Option A**: The body has acquired excess of electrons.
- This statement is true because gaining electrons leads to a negative charge.
- **Option B**: The body has acquired excess of protons.
- This statement is false because gaining protons would result in a positive charge, not a negative charge.
- **Option C**: The body has lost some electrons.
- This statement is false because losing electrons would make the body positively charged, not negatively charged.
- **Option D**: The body has lost some neutrons.
- This statement is irrelevant to electric charge, as neutrons do not carry any charge.

4. **Conclusion**:
- Since the body is negatively charged, it means that it has acquired an excess of electrons. Therefore, the correct answer is **Option A**: "The body has acquired excess of electrons."

### Final Answer:
The correct answer is **Option A: The body has acquired excess of electrons.**