In every experiment with potentiometer in the null point state, the potential difference between the ends of the galvanometer is

Options

A. zero
B. infinite
C. equal to the potential difference of the cell
D. unknown

Answer

To solve the question regarding the potential difference between the ends of the galvanometer in a potentiometer experiment at the null point state, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Null Point State**:
- In a potentiometer experiment, the null point is the condition where the galvanometer shows no deflection. This indicates that the potential difference across the galvanometer is balanced by the potential difference across the segment of the potentiometer wire.

2. **Current through the Galvanometer**:
- At the null point, the current flowing through the galvanometer is zero. This is a crucial observation because it indicates that there is no net flow of charge through the galvanometer.

3. **Relation between Current and Potential Difference**:
- According to Ohm's Law, the current (I) through a conductor is directly proportional to the potential difference (V) across it, given by the equation \( I = \frac{V}{R} \), where R is the resistance. If the current is zero (I = 0), it implies that the potential difference must also be zero (V = 0).

4. **Conclusion**:
- Since the current through the galvanometer is zero at the null point, the potential difference between the ends of the galvanometer must also be zero. Therefore, we conclude that:
\[ \text{Potential difference between the ends of the galvanometer} = 0 \, \text{V} \]

### Final Answer:
The potential difference between the ends of the galvanometer in the null point state is **0 V**.

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