In meter bridge experiment, to minimize an error due to contact resistance,

In meter bridge experiment, to minimize an error due to contact resistance,
  1. use non-uniform meter bridge wire.
  2. repeat the experiment by interchanging the resistance in gaps.
  3. increase the current flowing through meter bridge wire.
  4. changing the value of known resistance in the gap.

Solution

by interchanging the positions of known and unknown resistance. ~

Asked in: MHT CET 2020 (12 Oct Shift 1)

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