Question

when a wire elongates along the length it's radius increases or decreases​

Answer 1

Refer to attached Image ❣️

Answer 2

When a wire elongates along the length, it's radius decreases.

• The volume of the wire must remain same even after elongating.
• The volume of a wire is the relation between length and radius.
• So if the length increases the radius has to decrease so as to make the volume remain constant.
• This happens so because the volume of a material should be conserved.