Question

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

• A. end correction
• B. index error
• C. due to temperature effect
• D. random error

Hint:

In meter bridge, interchanging \(R\) and \(S\) removes end correction, because end resistances affect both sides equally and cancel in averaging.

Answer 1

The Correct Option is A

Step 1: Understand end correction.
In a meter bridge, the wire ends are connected to thick copper strips.
These strips add some extra resistance near the ends, so the wire is not perfectly uniform in practice.
Step 2: Why interchange resistances?
When we interchange known and unknown resistances, the balancing point shifts to the other side.
By taking average of the two readings, end errors cancel out.
Step 3: Hence error removed.
This method specifically removes the end correction error.
Final Answer: \[ \boxed{\text{end correction}} \]