• question_answer When a load of $1.0$ kg is suspended from a $1.0$ m long wire, its length increases by $1.0$ mm. Its radius would change by: A)  $1\,%$                                     B)  $2\,%$ C)  $0.1\,%$                                  D)  $0.2\,%$

$l\pi {{r}^{2}}\,=$ Constant  $\frac{\Delta l}{l}+2\,\frac{\Delta r}{r}=0$