A wire of diameter $1mm$ breaks under a tension of $1000\, N.$ Another wire, of same material as that of the first one, but of diameter $2\, mm$ breaks under a tension of ...... $N$
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(d) Breaking force $\propto r^2$
If diameter becomes double then breaking force will become four times i.e. $1000 \times 4 = 4000\, N$
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