8.Mechanical Properties of Solids
medium

$2 \,mm$ વ્યાસ ધરાવતા સ્ટીલના તારનો બ્રેકિંગ ક્ષમતા $4 \times$ $10^5 \,N$ છે. તો સમાન પરીમાણ ધરાવતા $1.5 \,mm$ ના સ્ટીલના તારનો બ્રેકિંગ બળ............ $\times 10^5 \,N$

A

$2.3$

B

$2.6$

C

$3$

D

$1.5$

Solution

(a)

We know

$\frac{\text { Force } \times \text { Length }}{\text { Area } \times \text { young's modulus }}=$ elongation $\quad\left\{\frac{F L}{A y}=\Delta x\right\}$

$\Rightarrow F=\left(\frac{\Delta x \cdot y}{L}\right) A$

$F=\left(\frac{\Delta x \cdot y}{L} \cdot \frac{\pi}{4}\right) d^2$

We can say $F \propto d^2$

So we can use

$\frac{F_1}{F_2}=\frac{d_1^2}{d_2^2}$  $\left\{\begin{array}{l}F_1=4 \times 10^5 N \\ d_1=2 mm \\ F_2=? \\ d_2=1.5 mm \end{array}\right\}$

Substituting values

$\frac{4 \times 10^5}{F_2}=\frac{(2)^2}{(1.5)^2}$

$F_2=2.3 \times 10^5 \,N$

Standard 11
Physics

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