A steel ring of radius $r$ and cross-section area $‘A’$ is fitted on to a wooden disc of radius $R(R > r)$. If Young's modulus be $E,$ then the force with which the steel ring is expanded is
A steel ring of radius $r$ and cross-section area $‘A’$ is fitted on to a wooden disc of radius $R(R > r)$. If Young's modulus be $E,$ then the force with which the steel ring is expanded is
- A
$AE\frac{R}{r}$
- B
$AE\left( {\frac{{R - r}}{r}} \right)$
- C
$\frac{E}{A}\left( {\frac{{R - r}}{A}} \right)$
- D
$\frac{{Er}}{{AR}}$
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