Question

Which of the following methods does not help to minimize the error due to contact resistance in Wheatstone's meter bridge experiment:

• A. The wire used must be uniform
• B. The wire used must be non-uniform
• C. Null point is obtained near the middle of the wire
• D. Interchange the positions of unknown resistance (X) and known resistance(R)

Answer 1

The correct option is B The wire used must be non-uniform

Non-uniform wires leads to increased error in the measurement of resistance in wheatstone's bridge experiment.