State any 'two' possible sources of errors in meter-bridge experiment. How can they be minimised?

Explanation

**Step-by-Step Solution:**

1. **Identify Possible Sources of Errors:**
- The first possible source of error in the meter-bridge experiment is the **non-uniformity of the wire**. If the wire used in the meter bridge is not uniform in cross-sectional area, it will have varying resistance along its length. This variation can lead to inaccurate measurements of resistance.
- The second possible source of error is the **heating effect of the current**. When current flows through the wire, it generates heat due to resistance. This heating can cause thermal expansion of the wire, which may change its length and affect the resistance measured during the experiment.

2. **Minimizing Non-Uniformity of Wire:**
- To minimize the error due to non-uniformity, it is essential to use a **uniform wire**. A wire that has a consistent cross-sectional area throughout its length will ensure that the resistance per unit length remains constant, leading to more accurate measurements.
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