Question 93: Properties of Matter

Question

The force required to stretch a wire of cross-section $$1 \mathrm{~cm}^{2}$$ to double its length will be : (Given Yong's modulus of the wire $$=2 	imes 10^{11} \mathrm{~N} / \mathrm{m}^{2}$$)

Accepted Answer

$$A = 1$$ cm
2
$$Y = {{Fl} \over {A\Delta l}}$$
$$F = {{YA\Delta l} \over l} = {{2 	imes {{10}^{11}} 	imes {{10}^{ - 4}} 	imes l} \over l}$$
$$ = 2 	imes {10^7}$$ N

Answer

$$1 	imes 10^{7} \mathrm{~N}$$

Answer

$$1.5 	imes 10^{7} \mathrm{~N}$$

Answer

$$2 	imes 10^{7} \mathrm{~N}$$

Answer

$$2.5 	imes 10^{7} \mathrm{~N}$$

Properties of Matter

The force required to stretch a wire of cross-section $1 \mathrm{~cm}^{2} to double its length will be : (Given Yong's modulus of the wire =2 \times 10^{11} \mathrm{~N} / \mathrm{m}^{2}$)

Choose the correct answer: