In the Searle's (two-wire) Young modulus experiment, a second reference wire is used to:

  1. double the load
  2. measure the diameter
  3. provide electrical current
  4. cancel the effects of temperature changes and sagging of the support
Answer

D) cancel the effects of temperature changes and sagging of the support

Both wires change equally, so only the load's extension is measured. SLO P-11-B-25 · Understanding

Physics MCQ · More Deformation of Solids MCQs · Practise