To break a wire of one meter length, minimum $40 \,kg \,wt$. is required. Then the wire of the same material of double radius and $6 \,m$ length will require breaking weight ....... $kg \,wt$
Medium
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(d) Breaking force = Breaking stress $\times$ Area of cross
section of wire
section of wire
$\therefore$ Breaking force $\propto$ $r^2$ (Breaking distance is constant)
If radius becomes doubled then breaking force will become $4$ times i.e. $40 \times 4 = 160\, kg\, wt$
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