Question 339: Properties of Matter

Question

A wire of length L, are of cross section A is hanging from a fixed support. The length of the wire changed to L
1
when mass M is suspended from its free end. The expression for Young's modulus is :

Accepted Answer

$$Stress = {{Mg} \over A}$$
$$Strain = {{\Delta L} \over L} = {{{L_{ - 1}} - L} \over L}$$
Young's modulus = $${{Stress} \over {Strain}}$$
= $${{MgL} \over {A\left( {{L_1} - L} \right)}}$$

Answer

$${{Mg\left( {{L_1} - L} \right)} \over {AL}}$$

Answer

$${{MgL} \over {A{L_1}}}$$

Answer

$${{MgL} \over {A\left( {{L_1} - L} \right)}}$$

Answer

$${{Mg{L_1}} \over {AL}}$$

Properties of Matter

A wire of length L, are of cross section A is hanging from a fixed support. The length of the wire changed to L 1 when mass M is suspended from its free end. The expression for Young's modulus is :

Choose the correct answer: