JEE Mains · Physics · STD 11 - 1. units,dimensions and measurement
In order to determine the Young's Modulus of a wire of radius \(0.2\, cm\) (measured using a scale of least count \(=0.001\, cm )\) and length \(1 \,m\) (measured using a scale of least count \(=1\, mm\) ), a weight of mass \(1\, kg\) (measured using a scale of least count \(=1 \,g\) ) was hanged to get the elongation of \(0.5\, cm\) (measured using a scale of least count \(0.001\, cm\) ). What will be the fractional error in the value of Young's Modulus determined by this experiment? (in \(\%\))
- A \(0.14\)
- B \(0.9\)
- C \(9\)
- D \(1.4\)
Answer & Solution
Correct Answer
(D) \(1.4\)
Step-by-step Solution
Detailed explanation
\(Y=\frac{\text { Stress }}{\text { Strain }}=\frac{ FL }{ Al }=\frac{ mg . L }{\pi R ^{2} \cdot \ell}\) \(\frac{\Delta Y }{ Y }=\frac{\Delta m }{ m }+\frac{\Delta L }{ L }+2 \cdot \frac{\Delta R }{ R }+\frac{\Delta \ell}{\ell}\)…
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