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Q.

A force F is needed to break a copper wire having radius R. The force needed to break a copper wire of same length and radius 2R will be

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a

2F

b

$\frac{F}{2}$

c

4F

d

$\frac{F}{4}$

answer is C.

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Detailed Solution

Breaking force =Stress $\times$ Cross-sectional area. When area is quadrupled we require 4 times force

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