NEET UG PHYSICS MCQ: MECHANICAL PROPERTIES OF SOLIDS

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Understanding +4 | -1

An iron bar of length

L

, cross-section

A

and Young’s modulus

Y

is pulled by a force

F

from both ends so as to produce an elongation

l

. Which of the following statement is correct?

View answer and explanation

Correct option: B

l \propto l/A

Option D,

l \propto l/L

is incorrect. Option B,

l \propto 1/A

is correct because elongation

l

is inversely proportional to the cross-sectional area

A

according to the formula

l = \frac{FL}{AY}

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