A meter scale of mass $m$ , Young modulus $Y$ and cross section area $A$ is hanged vertically from ceiling at zero mark. Then separation between $30\ cm$ and $70\ cm$ mark will be :-( $\frac{{mg}}{{AY}}$ is dimensionless)
A meter scale of mass $m$ , Young modulus $Y$ and cross section area $A$ is hanged vertically from ceiling at zero mark. Then separation between $30\ cm$ and $70\ cm$ mark will be :-( $\frac{{mg}}{{AY}}$ is dimensionless)
- A
$30\frac{{mg}}{{AY}}\ cm + 40\ cm$
- B
$20\frac{{mg}}{{AY}}\ cm + 40\ cm$
- C
$50\frac{{mg}}{{AY}}\ cm + 40\ cm$
- D
$40\frac{{mg}}{{AY}}\ cm + 40\ cm$
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