JEE PHYSICS MCQ: UNITS & MEASUREMENTS

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Analyzing +4 | -1

A rectangular beam which is supported at its two ends and leaded in the middle with weight w sags by an amount δ such that

\delta = \frac{{w{l^3}}}{{4Y{d^3}}},\;

, where

l,d

and Y represent length, depth and elasticity respectively. Guess the unknown factor using dimensional considerations

View answer and explanation

Correct option: A

Breadth

The correct answer is A (Breadth) because dimensional analysis shows the unknown factor must have dimensions of length, which corresponds to breadth.

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