In which one of the following situations does a conventional electric current flow due north?

Options

A. Protons in a beam are moving due south.
B. A water molecule is moving due north.
C. Electrons in a beam are moving due south.
D. None of these

Answer

To determine in which situation a conventional electric current flows due north, we need to understand the relationship between the flow of electric charge and the direction of current.

### Step-by-Step Solution:

1. **Understanding Conventional Current**:
- Conventional current is defined as the flow of positive charge. By convention, it flows from the positive terminal to the negative terminal of a power source.

2. **Direction of Charge Carriers**:
- In most conductive materials, the charge carriers are electrons, which are negatively charged. Therefore, if electrons flow in one direction, the conventional current flows in the opposite direction.

3. **Identifying the Direction**:
- If we want the conventional current to flow due north, we need to consider the direction of the charge carriers.
- If the conventional current is flowing north, the electrons must be flowing south (since they are negatively charged).

4. **Conclusion**:
- The situation where the conventional electric current flows due north is when the electrons are moving towards the south.

### Final Answer:
The conventional electric current flows due north when the electrons are moving towards the south.

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