If a resistive wire is elongated, its resistance?

Options

A. (a) decreases
B. (b) remains constant
C. (c) increases
D. (d) All of the above

Answer

C

Explanation

Poisson strain is defined as the negative ratio of the strain in the traverse direction (caused by the contraction of the bar.s diameter) to the strain in the longitudinal direction. As the length increases and the cross sectional area decreases, the electrical resistance of the wire also rises.