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: End Error in Meter Bridge Explained
In a meter bridge, the resistance of the L-shaped metallic strips is assumed to be zero. However, this resistance exists and causes a systematic measurement error known as end error.
Step 2: Impact of End Error
End error distorts the meter bridge's balancing condition, leading to inaccurate calculations of unknown resistance.
Step 3: Eliminating End Error
To mitigate end error:- Swap the positions of the resistance box and the unknown resistance, and average the readings.- This method cancels out the error from the connecting strip resistances for improved accuracy. Final Answer: The error eliminated by swapping resistances in the meter bridge is termed end error.