When a metal conductor connected to left gap of a meter bridge is heated, the balancing point

Options

A. shifts towards right
B. shifts towards left
C. remains unchanged
D. remains at zero

Explanation

To solve the problem regarding the effect of heating a metal conductor connected to the left gap of a meter bridge on the balancing point, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Meter Bridge**:
A meter bridge is based on the principle of Wheatstone bridge. It consists of a wire of uniform cross-section and resistance, and it is used to measure unknown resistances by balancing the bridge.

**Hint**: Recall that the meter bridge operates on the principle of balancing two resistances.

2. **Initial Setup**:
In the meter bridge, one side (left gap) has a metal conductor (unknown resistance) and the other side has a known resistance. The balancing point is where the bridge is balanced, meaning the ratio of the resistances on both sides is equal.

**Hint**: Remember that the balancing point is determined by the ratio of the resistances.

3. **Effect of Heating the Conductor**:
When the metal conductor is heated, its resistance increases. This is due to the property of metals where resistance is directly proportional to temperature.

**Hint**: Consider how temperature affects the resistance of conductors.

4. **Relationship Between Resistance and Balancing Length**:
The resistance of the conductor is directly proportional to the balancing length on the meter bridge. Thus, if the resistance of the conductor increases, the balancing length must also increase.

**Hint**: Think about how an increase in resistance affects the position of the balancing point.

5. **Direction of Balancing Point Movement**:
Since the resistance in the left gap increases, the balancing point will shift towards the right side of the meter bridge. This is because the increased resistance requires a longer length of the wire on the left side to balance the known resistance on the right side.

**Hint**: Visualize the meter bridge and how the balance is achieved when one side's resistance changes.

6. **Conclusion**:
Therefore, when the metal conductor connected to the left gap of the meter bridge is heated, the balancing point shifts towards the right.

**Hint**: Summarize your findings to confirm the direction of the shift in the balancing point.

### Final Answer:
When a metal conductor connected to the left gap of a meter bridge is heated, the balancing point shifts towards the right.