In Searle's experiment

PHYSICS · Subjective · CBSE · Physics · Units and Measurements · Units and Measurements

Problem

In Searle's experiment, used to find Young's modulus of elasticity, the diameter of the experimental wire is

d=0.05\,\text{cm}

, measured by a scale of least count

0.001\,\text{cm}

, and its length is

l=110\,\text{cm}

, measured by a scale of least count

0.1\,\text{cm}

. A weight of

50\,\text{N}

causes an extension of

\Delta l=0.125\,\text{cm}

, measured by a micrometer of least count

0.001\,\text{cm}

. Find the maximum possible error in Young's modulus. The screw gauge and metre scale are free from zero error.