Question

In meter bridge or Wheatstone bridge for measurement of resistance, the known and the unknown resistance are interchanged. The error so removed is:

• A. End error
• B. Index error
• C. Due to temperature effect
• D. Random error

Hint:

\textbf{End error} in a meter bridge experiment arises due to the resistance of the connecting metallic strips.
It is eliminated by interchanging the known and unknown resistances and averaging the results.

Answer 1

The Correct Option is A

Step 1: Understanding End Error in Meter Bridge
In a meter bridge experiment, it is assumed that the resistance of the L-shaped metallic strips used in the setup is negligible. However, in reality, this resistance is not truly zero, leading to a systematic error in measurements. This error is known as the end error.
Step 2: Effect of End Error
The presence of end error affects the balancing condition of the meter bridge. This results in incorrect calculations of the unknown resistance, causing measurement inaccuracies.
Step 3: Removal of End Error
To minimize or eliminate the end error, the following corrective measure is used: - The resistance box and the unknown resistance are interchanged, and the mean of both readings is taken. - This ensures that the error due to the resistance of the connecting strips cancels out, leading to a more accurate measurement. Final Answer: The error removed by interchanging the resistances in the meter bridge experiment is called end error.