Physics - Elasticity Question with Solution | TestHub

PhysicsElasticityMiscellaneousMedium2 minQB

PhysicsMediummultiple choice

Two joined steel bars ( $Y = 2 \times 1 0^{11} Pa$ ) have equal elongation. Left bar: $L_{1} = 0.6 m$ , $A_{1} = 15 c m^{2}$ . Right bar: $L_{2} = 0.4 m$ , unknown area.

Options:(select one or more)

Answer:

A, D

Solution:

$\frac{L _{1}}{A _{1}} = \frac{L _{2}}{A _{2}}$ .

$A_{2} = 15 (\frac{0.4}{0.6}) = 10 c m^{2}$ .

Stress ratio is $2 : 3$ .

For similar sections, lateral decrease $\propto \frac{1}{A}$ , larger on right.

Stream:JEESubject:PhysicsTopic:ElasticitySubtopic:Miscellaneous

⏱ 2mℹ️ Source: QB

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