Question

Poisson’s ratio is given by which of the following relation?

(a) µ = –\(\frac{\Delta d/d}{\Delta l/l}\)

(b) µ = –\(\frac{\Delta d}{\Delta l/l}\)

(c) µ = –\(\frac{d}{\Delta l/l}\)

(d) µ = –\(\frac{\Delta d/d}{\Delta l}\)

This question was addressed to me during an online interview.

My query is from Operation of Strain Gauges topic in portion Transducers of Electrical Measurements

Answer 1

Correct choice is (a) µ = –\(\frac{\Delta d/d}{\Delta l/l}\)

For explanation I would say: Poisson’s ratio is given by the relation

µ = –\(\frac{\Delta d/d}{\Delta l/l}\)

where,  d is the diameter of the cross-section of the wire

        ∆d is the change in the diameter of cross-section of the wire.