When a body is charged by conduction, its mass

Options

A. remains same.
B. increases.
C. decreases.
D. increase or decréase.

Explanation

To determine the effect on the mass of a body when it is charged by conduction, we can analyze the process step by step.

### Step-by-Step Solution:

1. **Understanding Charging by Conduction**:
- Charging by conduction involves direct contact between a charged body and a neutral body. When they come into contact, charge is transferred from one body to the other.

2. **Charging a Body Negatively**:
- If a neutral body is charged negatively by conduction, it gains extra electrons from the charged body.
- Since electrons have mass, the addition of these electrons will increase the mass of the neutral body.

3. **Effect on Mass**:
- Therefore, when a body is negatively charged by conduction, its mass increases due to the gain of electrons.

4. **Charging a Body Positively**:
- Conversely, if a neutral body is charged positively by conduction, it loses some of its electrons to the charged body.
- The loss of electrons means that the total mass of the body decreases, as it is losing particles that have mass.

5. **Conclusion**:
- In summary, when a body is charged by conduction:
- If it gains electrons (negatively charged), its mass increases.
- If it loses electrons (positively charged), its mass decreases.

### Final Answer:
- When a body is charged by conduction, its mass can either increase (if negatively charged) or decrease (if positively charged).

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