The extension in the experiment is measured with:

  1. an ammeter
  2. a metre rule
  3. a vernier scale (or micrometer) attached to the wires
  4. a protractor
Answer

C) a vernier scale (or micrometer) attached to the wires

Extensions are fractions of a millimetre. SLO P-11-B-25 · Understanding

Physics MCQ · More Deformation of Solids MCQs · Practise